Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd82f8a8f81faa4…

MALICIOUS

PDF

44.5 KB Created: 2018-12-02 20:18:05 +03:00 Authoring application: Acrobat PDFMaker 11 for Word (via Acrobat Distiller 11.0 (Windows))
MD5: 0cda51c88a5c01edd6b81f44d926a2a3 SHA-1: 173655f26417079b0050eb017665087d63071cb1 SHA-256: 8bd82f8a8f81faa471ffe9fdf420ae3072f71f364b7e1030b7bf3c53e625418e
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8683

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/creating-a-mindset-that-our-digital-actions-are-public-and.pdf
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    • http://www.gorillawalker.com/hush-harbor-praying-in-se
    • 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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