As 2gypsies said much of the good boondocking close to Moab/Canyonlands has been shut down due to overuse/abuse and I strongly suspect lobbying from campgrounds. There is some out Kane Creek road along with some first come primitive camps near the river a bit closer to town along the same road. All the good stuff south of town has been shut down, not sure about up north.
We like Horsethief campground on the way out to Dead Horse Point for more "away from it" camping, if visiting Moab proper Ken's lake has some nice sites, early/mid May is prime time so I'd arrive mid week and look for a spot.
The link 2gypsies gave you is the same one I was going to post. Good luck and have fun.
You don't say which browser you're using but check the "add ons". My wife picked up an advertising add on called tidynetwork somehow. Just can't convince her not to say "yes" to free software. In this case removal was as easy as deleting the add on from Firefox.
If you can ID which adware has infected you Googling "how to remove XXXXXXXX" generally will give you step by step instructions.
This has been an issue on almost every forum I've ever been on. There is usually a "core" of folks that do the discussion thing and help out and a lot of folks that just think it's a free information resource and don't think it's necessary to come back with what the solution was or a quick "thank you".
It sure would help future folks if the OP would come back and at least let us know which of the posted possibilities was the correct solution.