Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3f5a513f9cceea…

MALICIOUS

PDF

41.9 KB Created: 2019-04-10 12:10:08 +03:00 Authoring application: Acrobat PDFMaker 7.0 for Excel (via Acrobat Distiller 7.0 (Windows))
MD5: b1ea5b3e8de422c9d0d614279ab99b6c SHA-1: 88f39d99b4ec96e959f4f698c0697818b4f518fa SHA-256: 4a3f5a513f9cceea0f0fbb1eb4d4920eb219bec3c9826e092a6cfaf740e1ead1
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted, and the document body was largely unreadable, but the heuristic 'PDF_SEO_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content hosted on www.gorillawalker.com.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9181

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/micromechanism-of-cleavage-fracture-of-metals-a-comprehensive-microphysical-model.pdf
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    • http://www.gorillawalker.com/twisted-loyalties-par
    • 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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