Malicious PDF — malware analysis report

Static analysis result for SHA-256 b181e764a246e8d5…

MALICIOUS

PDF

94.2 KB Created: 2020-11-21 13:03:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c3045d8ec223f6ca3f2144ec4baf4863 SHA-1: a0c6ea40a2d3415a117479339fefa0be73391c57 SHA-256: b181e764a246e8d58a66d081a2526d0bbbe3425db0104c463996bafdc6312f15
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, with one prominent link pointing to 'trafffe.ru'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure suggests an attempt to redirect users to potentially malicious or SEO-abused content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://trafffe.ru/123?utm_term=alex+clarke+killer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f8e7638774a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f9a2871db8d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f8e28463726e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_5fb33c5de0739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f9df5b1724e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_5fb60c037daef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_5fb885ab17df1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_5fad69d61ba15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_5fb5f8ae42b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5f8fcedf3568f.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/nagifesataguze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417645/normal_5f95efdbacd90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5faaaa0f97e53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/zupobegekupexetebilibe.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/torofukufediluf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 4736 bytes
SHA-256: eb0de10011186f10be48344237b44c292ecba01f03c842d7da82b6e826f847b2
font_01_sfnt_off00014943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14943 10112 bytes
SHA-256: 7e700a4c58d201c36e4dee53ec43c53175ff05016b94bf485c32d2daa15085e7

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