An advertisement has been attached to the site address, what is it?

Question

Malware

Good day to all!

A friend showed me strange photos of poker ads on my website.
There is a site example.com. A friend types exemple in the search bar and the first thing he comes up with is a link to a poker ad. At the same time, if I type the name of the site into Google, then I get quick links and everything is fine. In the next photo I see a page with poker ads and my site in the address bar and then ads. There is no such thing in the admin panel of the page. If I manually type the address from the photo, then I am thrown to the main page, since there is a redirect from 404 pages.
What kind of animal is this and how to deal with it?

Answer 1

Hello.
There may be several options, there are not enough details to draw any conclusion. Maybe the operator interferes with the traffic, maybe you have a virus on your site that is sharpened for clicks on requests from the PS, there may be a virus on a friend's computer.

Answer 2

Option 1: a friend does not use a banner cutter, and he is given such contextual advertising.
Option 2: a friend has a stupid virus on his computer.