Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc4897d2bf670fb…

MALICIOUS

PDF

65.4 KB Created: 2020-12-15 22:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: de83ebfa110f1c9207e28d5458c36ea8 SHA-1: 040ae071cda312ffb974191837a245e44759b87e SHA-256: bcc4897d2bf670fbfb9b6cf409ede776c5d02aad10dd246ce58246310c99982f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'cctraff.ru'. Another heuristic flags it as a PDF link farm, containing 26 external links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cctraff.ru/strik?utm_term=beagle+puppies+for+sale+in+michigan In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fbd64df2524e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f8936ac657ec.pdfIn PDF document text
    • https://vekekugez.weebly.com/uploads/1/3/4/8/134883785/jomolidusufefanas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_5fa12327e0739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5f98b0e787391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5f9c1683678cd.pdfIn PDF document text
    • https://kajukuka.weebly.com/uploads/1/3/4/3/134307777/7406914.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1bcab3-61bf-4998-b48b-174ab02c58f1/jiviteterudewafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9cbf34-16ea-40a4-9d4e-8b5f44e229dd/wes-state-mortgage_in_eugene_oregon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fdd2bf5-e195-46d1-891e-747016bbe552/49723107042.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc042db8787e8798968ae67/t/5fc1c53218e72e5fdb19b64a/1606534450945/colorado_caps_background_check.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc002d40b6b03258f30bf3d/t/5fc3a05c4f983757204ed4e3/1606656093537/47383891993.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc390d740f1034a5cb9ab78/t/5fce3790662d5e24e0cdd400/1607350160909/lawnchair_2_pre_alpha_apk.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_off0000c328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC328 5480 bytes
SHA-256: 664451e25d58240a2116b958ae8a5a372392d5a834f5106d45a46b5a0ce6ec01
font_01_sfnt_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 10348 bytes
SHA-256: c08a27f3f4bc52de9a723158f719cdcb2c21161fc611c311b2362088ce28ea33

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