Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a3e001587c93cf…

MALICIOUS

PDF

67.7 KB Created: 2020-12-21 12:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9a7f624dbe1b0fcc56399b1096d18bd SHA-1: 13ffe54688a1f3feaa096de8e2cbe07d5d8de3d0 SHA-256: 37a3e001587c93cf986544aa1c089126f1a36d670bcfa0cb172bccbaac073074
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'ggtraff.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?utm_term=samurai+wallpaper+hd+iphone
    • https://cdn-cms.f-static.net/uploads/4477638/normal_5fdafdf4715a7.pdf
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/82b32cc5831e772.pdf
    • https://tujezaxe.weebly.com/uploads/1/3/4/6/134616668/5870198.pdf
    • https://static.s123-cdn-static.com/uploads/4369183/normal_5fc6746fbc4da.pdf
    • https://tirotulesi.weebly.com/uploads/1/3/4/8/134849952/resetuf.pdf
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f871ddfb09b2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fdfeb28c66bff209e82f62f/t/5fe019faa3b92b153c4de1b5/1608522235191/bitlocker_windows_10_free_filehippo.pdf
    • https://static1.squarespace.com/static/5fdcb8173599a867de449200/t/5fdd1bdf69ef8811ad7ca5ee/1608326113701/bootstrap_simple_theme_free.pdf
    • https://uploads.strikinglycdn.com/files/dd9d6d83-3acd-4f40-ae90-53dd8cd56251/84081052819.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/importance_of_entrepreneurship_skills.pdf
    • https://uploads.strikinglycdn.com/files/4e745df8-a4af-4c43-8c34-1d447ab0a492/adam_marcus_emory.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c278.bin
c72eca6d9a7c631ee071987865abe1c5ffa5bf570d1d6fad8b16666bdfddc4b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC278 5216 bytes
font_01_sfnt_off0000d40e.bin
94f7f04c354b7c42189b541209bdac3d2056a6ae94e17fa8fbf2c94236be72ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 1872 bytes
font_02_sfnt_off0000dcfd.bin
a2f27e55cc197557729ae3048cc2e496f848b2d7d7ed6cb5ee5fda700039f877		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 10900 bytes

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