This URL should be to the press release from the source, at http://www.cwi.nl/news/2015/researchers-urge-industry-standard-sha-1-should-be-retracted-sooner http

This URL should be to the press release from the source, at http://www.cwi.nl/news/2015/researchers-urge-industry-standard-sha-1-should-be-retracted-sooner http://www.cwi.nl/news/2015/researchers-urge-industry-standa... and not a PDF from a generic sites.google.com page. The less generic sites page for the project is https://sites.google.com/site/itstheshappening/ https://sites.google.com/site/itstheshappening/ . (It appears that the submitter posted to the news announcement PDF url from the project's site, but Google sees an incoming external link directly to the PDF, and presents it to HN readers as an attachment.)