A full screen transparent (invisible to user) malicious advertisting web page overlays a site containing coloring pages for kids. Malwarebytes warns of this special danger in the following post

https://blog.malwarebytes.org/privacy-2/2015/04/ads-on-colouring-pages-website-lead-to-installs-explicit-content/

Today, we came across a website called “Best Arts Wallpaper Online 2015″ which offers colouring pages intended to be printed / drawn on by the smaller members of your family. The site features Minions (From Despicable Me), My Little Pony, Batman, Mario, Looney Tunes and more – clearly, there’s a wide range of interests on offer.

The page is overlaid with a transparent full-window ad (the page doesn’t look as grey once the advert is gone) – you can see the “x” in the top right hand corner. Clicking the visible banner in the middle will take you to the ad. However, clicking anywhere else on the page with the exception of the “x” will still cause it to act as though the ad in the middle of the page had been clicked – and you’ll also have the possibility of another window opening containing entirely unrelated content.

Clearly, this isn’t somewhere you want the intended audience hanging out as they grab pages for you to print. There’s no real way to know what they may end up installing, and as for the last example – who knows where some of those URLs might lead.

Here’s some safer examples of colouring in for you and your family to make use of:

Disney – Colouring in
BBC – Crafts and colouring in
Crayola – Colouring in
LEGO – Colouring in
Nick Jr – Colouring in