This URL should be to the press release from the source, at <a href="http:&#x2F;&#x2F;www.cwi.nl&#x2F;news&#x2F;2015&#x2F;researchers-urge-industry-standard-sha-1-should-be-retracted-sooner" rel="nofollow">http:&#x2F;&#x2F;www.cwi.nl&#x2F;news&#x2F;2015&#x2F;researchers-urge-industry-standa...</a> and not a PDF from a generic sites.google.com page. The less generic sites page for the project is <a href="https:&#x2F;&#x2F;sites.google.com&#x2F;site&#x2F;itstheshappening&#x2F;" rel="nofollow">https:&#x2F;&#x2F;sites.google.com&#x2F;site&#x2F;itstheshappening&#x2F;</a> .<p>(It appears that the submitter posted to the news announcement PDF url from the project&#x27;s site, but Google sees an incoming external link directly to the PDF, and presents it to HN readers as an attachment.)