Fraud & invalid traffic
Domain spoofing
Domain spoofing is falsely claiming that traffic or ad space comes from a well-known, trusted website when it really comes from somewhere else.
Advertisers and feed owners pay more, and worry less, when traffic appears to come from a respected site. Domain spoofing exploits that by lying about the origin: the request says "this visit is on a famous news site" when it is on an unknown page or no page at all.
In display advertising the main counter-measure is ads.txt, a public file listing who may sell a site's ad space. In search arbitrage the same lie takes a different shape. Feeds are approved per domain and per traffic source, so a fraudster reports clicks under an approved domain or Channel ID while the users are actually somewhere unapproved. It often overlaps with referrer spoofing and traffic laundering.
Red flags are a mismatch between the declared domain and the page where the ad actually rendered, traffic volumes the real site could not produce, and audience data (countries, devices) that does not fit the claimed site.
The MRC standards class misrepresented origin as SIVT. Defence means verifying the rendering page independently of what the request claims, and auditing partners' domains regularly.
Think of it like this
It is selling a knock-off handbag with a luxury label sewn in. The buyer pays for the name and gets something else.
Related terms
Referrer spoofing
Referrer spoofing is faking the information that says which page a visitor came from, to make low-quality traffic appear to come from a trusted source.
Traffic laundering
Traffic laundering is passing low-quality or prohibited traffic through intermediate sites and redirects so it reaches a search feed looking clean and legitimate.
ads.txt
ads.txt is a public text file on a website listing the companies authorised to sell that site's ad space, so buyers can spot unauthorised or counterfeit sellers.
SIVT (sophisticated invalid traffic)
SIVT is invalid traffic designed to look like real people, which can only be found with advanced analysis that compares many signals at once.
Channel ID (custom channel)
A channel ID is a label attached to search ad requests so that revenue and clicks can be reported separately for each page, campaign or traffic source.
Sources: MRC Invalid Traffic Detection and Filtration Standards Addendum (June 2020 update), IAB Tech Lab: ads.txt