Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6715046ccc8436…

MALICIOUS

PDF

44.2 KB Created: 2019-04-06 14:58:02 +03:00 Authoring application: TeX (via pdfTeX-1.40.16)
MD5: db3af59d68d7ccc127a0815ed659ed44 SHA-1: 9d005300e8ce6b1a931425fad6b2f8968330ab90 SHA-256: 1a6715046ccc8436cab626532a8bbf2358cfa8eca4ad6d679da4c50787bff56b
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of this link farm. The primary attack pattern appears to be a link farm designed to manipulate search engine results or to distribute malicious content via the numerous linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8990

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/how-to-restore-your-collector-bicycle-bicycle-books.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/

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