The Article has a link to the official site and below is the short film the movie is based on.
A bit of trivia ~ there's an SA movie called The Fourth Reich
too and it deals with the true story of Nazis trying to destabilize South Africa in WW2 by assassinating their leader General Smuts. Their tool is one Robey Leibbrandt, an Olympic boxer who fell under Hitler's spell at the 1936 Berlin Olympics. No zombies in this one.