Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d239a4e4a1c208a…

MALICIOUS

PDF

34.3 KB Created: 2020-01-17 19:20:56 +03:00 Authoring application: Acrobat PDFMaker 8.1 for Word (via Acrobat Distiller 8.1.0 (Windows))
MD5: 142ca3059503147825887df3477e1a70 SHA-1: 01bf0edf9437fc05e6d8a3a267d13db592f4c539 SHA-256: 8d239a4e4a1c208a3890e5438fd955aab426d08a02c7ad42767583baad86bd58
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs pointing to external websites, identified by the PDF_SEO_LINK_FARM heuristic. This suggests the document is likely part of a link farm or SEO manipulation scheme, potentially leading users to malicious content or phishing pages. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample.

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/the-forests-of-silence-deltora-quest-series.pdf
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    • http://www.gorillawalker.com/folens-history-renaissance-revolution
    • 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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