Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3641ed753eeaa7…

MALICIOUS

PDF

33.4 KB Created: 2020-01-03 01:15:40 +03:00 Authoring application: - (via Acrobat PDFWriter 3.02 for Windows NT)
MD5: 7f9f306fdb88d4e6a8742bdac99239a0 SHA-1: adce3001a38e8034a64685d054b89278fe3a37eb SHA-256: 4c3641ed753eeaa7c369fa2d4c6a78aaf2e7915f792600cb151d67202ad5c863
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to external websites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the sheer volume of links suggests a malicious intent, possibly for SEO manipulation, phishing, or to serve further malicious content. The document body was heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8529

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/piano-for-the-developing-musician-comprehensive-edition.pdf
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    • http://www.gorillawalker.com/fred-sandback-drawings.pdf
    • http://www.gorillawalker.com/hope-in-my-heart-my-america.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/