There is indeed an issue with the advertisements on our website, and we're looking into the issue. We've been having troubles with it lately, which is why you might be getting strange adverts, as well. We cannot make any changes to the game until we're able to have Raz look at it, and he is currently MIA. It's on our priority list to make sure that everything is resolved there, though, so please hang tight. <3
As long as you do not click anything on the pop-up pages that appear, you should be fine. When you log in, there is an option to immediately exit out of the new pop-up window, and it works well for me. It is true that we need advertisements to keep the game running, since it is what pays to keep the server open. We will do what we can to make sure that there aren't things contained that will harm your computer, but there is little we can do until Raz is able to look at it and determine if there is a better solution.