Malicious PDF — malware analysis report

Static analysis result for SHA-256 a396a1a1b15d6e3e…

MALICIOUS

PDF

45.3 KB Created: 2018-11-14 11:19:48 +03:00 Authoring application: Data Dynamics ActiveReports (tm) for .NET
MD5: e109b1e45e41fdf64637916b6a804d33 SHA-1: aaa1bcbf67ff221343442c29882f58e624ec1bd6 SHA-256: a396a1a1b15d6e3e4ba3a5860a3d55e514a77927a7fd65843ce87d4ff80a4712
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external URLs, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. The primary function appears to be directing users to a vast collection of other PDF files hosted on www.gorillawalker.com, suggesting a link farm or SEO poisoning attack. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8439

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/backcountry.pdf
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    • http://www.gorillawalker.com/30-minuten-bewerben-mit-profil-german-edition.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/