Malicious PDF — malware analysis report

Static analysis result for SHA-256 5842523a02a8ce35…

MALICIOUS

PDF

45.3 KB Created: 2018-11-26 20:03:36 +03:00 Authoring application: TeX (via pdfTeX-0.14h)
MD5: c89fc30aa91eb15a14458054661d6de9 SHA-1: 63a91e5c15f73b5cde7f3da032c344e106fe8b15 SHA-256: 5842523a02a8ce358c12244cd96bdda9ebcd8774cc64b9438edf0c4e230d6e69
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on the domain www.gorillawalker.com. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be a link farm designed to direct users to a multitude of other documents, potentially for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8812

Heuristics 2

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.gorillawalker.com/executive-jets-enthusiast-color-series.pdf
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    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.aiim.org/pdfa/ns/extension/
    • http://www.aiim.org/pdfa/ns/schema#
    • http://www.aiim.org/pdfa/ns/property#
    • http://www.aiim.org/pdfa/ns/id/