Google is running out of ways to keep up with revenue expectations, it's becoming quite obvious. Even Chrome has small ads at the bottom from time to time now, the desperation is quite clear.
Nope, it has/had a line of linked text that promoted the new Pixel phone. Not graphical and definitely not malware. Was on the tiled start page a few weeks ago. An ad by Google, I took a screenshot, I’ll try to find it.