These kind of ads pop up all the time for me, making different words green, underlined and clickable. Don't know how it started. Happens both at home and at work. I find not clicking on them the easies solution.
I should add that I had them too for a while. I can't remember now exactly, but it seemed to be more on my work computer than at home.
I recall one word that appeared often on pages being green, underlined and clickable: Lenders
I didn't click on it just moused over and a little square opened up with some text about loans or something.
Feel like it hasn't happened for a few weeks but if I notice it again I'll get a screencap.