That's nothing particularly new for North Korea. It's the standard mode for NK propganda to describe enemies of the regime as subhuman or degenerate.
Back in May they had released a statement describing Obama as someone sho "does not even have the basic appearances of a human being" and that "it would be perfect for Obama to live with a group of monkeys in the world’s largest African natural zoo and lick the breadcrumbs thrown by spectators."
http://www.washingtonpost.com/world/asia_pacific/north-korean-screed-against-obama-illustrates-race-based-worldview/2014/05/08/9bc7a68f-7b71-4110-b4f1-85ae05c92777_story.html