I noticed that in the comments of a lot of addons there is this comment: 

I find a new QuestHelper and to share   www.curse-addons.com
I appreciate all the hard work you've put into it.
Very simple.

I've seen it a lot lately. Today I clicked the link to see what it is.
And I think its a nasty site. It looks like a new addon site or something, but when you mouse over a 'download-button' it all has ...exe files.
Doesn't seems right to me and worth a warning I think.
I didn't downloaded one, cause I don't want to take the risk, but maybe someone from curse can look into it, and take action to remove these advertisements

Thanks for the warning. This kind of stuff is exactly why I only use curse.com for my addon needs. Helps to keep it simple.

You should edit your link so no one could actually click on it.  Just a thought.

Good idea and done

Thanks for the heads up; i'm going to see if I can't get that domain reported/removed.