At the moment there is the following question on the first page of the questions list:
https://mathoverflow.net/questions/149697/can-anyone-tell-some-about-mobile-affiliate-programs-like-yeahmobi

It is already marked as [on hold], but it seems to me that it is outright spam. I would rather see such questions be deleted at once. Should I flag such a question as spam, or am I being overactive if I do that? (After all, it is already marked [on hold], so clearly moderators are aware of the question.)

What exactly is the right action when one encounters such a question?