Knight's Fable
They have had issues with other games doing this as well. Here is what Gaile from Anet requests if you run across such things:
https://forum-en.gw2archive.eu/forum/game/gw2/Has-anyone-noticed/first#post4612902
If you could kindly post a direct link to the ad — not to where the ad leads but to the ad itself — we can investigate.
The Burninator