Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6468d3c60719d69…

MALICIOUS

PDF

68.6 KB Created: 2021-01-05 21:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: aaec95039a436ddcae4f4fd863fe750a SHA-1: d20a5c6a706360c3ffe4ee51618f78a0bea9c17c SHA-256: e6468d3c60719d69a4f41a5cd0ee2411d0a502485002d901523b61750fd22387
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically identifies a link to 'cctraff.ru', a known malicious redirector. The ML classifier and ClamAV detection further support the malicious nature of this file, indicating it is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/aws?utm_term=baroque+art+worksheet In PDF document text
    • https://kixipebirivevex.weebly.com/uploads/1/3/0/7/130739750/0410fba5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427499/normal_5ff41422c9951.pdfIn PDF document text
    • https://xovigojimere.weebly.com/uploads/1/3/4/8/134854331/barigokalinobane.pdfIn PDF document text
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/a2acf0fb6eba0c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454813/normal_5fe353d70ba37.pdfIn PDF document text
    • https://zetosodorab.weebly.com/uploads/1/3/2/7/132712291/22f3c6f07a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_5fa777a572230.pdfIn PDF document text
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/farotuzas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368788/normal_5fdee080af4c5.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/bogeguva/adjective_exercises_with_answers_for_class_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0065c20-7322-4a04-8bb7-67e1ee0e52c7/77236898900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d175fac-fd57-483e-880d-a6b5c1dc125c/34779670251.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_off0000cf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 5072 bytes
SHA-256: 9b2a66eafbe86309ef036027c1ce4c795410f12debe1a50f5886e96d817d8723
font_01_sfnt_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 11352 bytes
SHA-256: 394a5762b61d07edacad0ed2621b9d7af3ad5cbd2a29959da89e30af488c02fd

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