Malicious PDF — malware analysis report

Static analysis result for SHA-256 929ae942b73a03e0…

MALICIOUS

PDF

67.7 KB Created: 2021-01-08 00:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3925006a8a29d1edf4cd4a5e58cfec94 SHA-1: d473b134a7809af3c156d79ec0721aa007680c64 SHA-256: 929ae942b73a03e05229d82c72f10bd3eaf337c62b16bf0720a554e14d608c8b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ggtraff.ru'. It also exhibits characteristics of a link farm, with numerous external PDF links pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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/123?utm_term=lowes+in+bedford+ohio
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5f9dca0d7069b.pdf
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/5f563d6dfdf708f.pdf
    • https://litemavokof.weebly.com/uploads/1/3/1/8/131871991/b72c9828920.pdf
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5fd76b14dd0f0.pdf
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/abab9db84e.pdf
    • https://dikefurilixi.weebly.com/uploads/1/3/4/6/134684794/c7cf61.pdf
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd7c5235d152.pdf
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/eb251.pdf
    • https://static.s123-cdn-static.com/uploads/4368748/normal_5fc60452af2e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/firigugixujotov/editor_video_apk_download_free.pdf
    • https://s3.amazonaws.com/bubeto/57894280429.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb46.bin
189700d1f46b82c0d5685b33a4ccbcb797b8000f48a414382537ab2ee8fa873e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 4924 bytes
font_01_sfnt_off0000dc16.bin
2f34aa2e55062c7986e6bffc37ce832d12940564c922da1f6407679f5cda3dc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 11604 bytes

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