Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf7df96121a3056…

MALICIOUS

PDF

69.8 KB Created: 2020-12-23 06:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 42509d0ad76b6a3ab8452beb6731ad56 SHA-1: 7f94c5190b0d1e842ed39e09620ab6d4a5bbdf8f SHA-256: 3cf7df96121a30561fbb642e180480fbc183ca7b83f6674e78087f7247d0d863
214 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'traffmen.ru'. The document body, though heavily obfuscated, appears to reference 'Pawn shop master mod apk no ads', suggesting a lure for a cracked application. The presence of numerous external links, including one to a potentially malicious redirector, indicates an attempt to drive traffic to malicious sites.

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://traffmen.ru/strik?utm_term=pawn+shop+master+mod+apk+no+ads In PDF document text
    • https://static.s123-cdn-static.com/uploads/4473656/normal_5fcc253aa7847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5faf2e5aa340b.pdfIn PDF document text
    • https://vipelunova.weebly.com/uploads/1/3/2/7/132712034/2491247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5fad9e9bd0f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_5f96e26e1e435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_5fdbc8b00257f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428043/normal_5fa23ff92a29f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459630/normal_5fb7f98ba5d17.pdfIn PDF document text
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/2bfea.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/e40f97c6-d34a-4f4c-b4f9-7d2ea380b00c/grave_digger_rc_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c6ee51-f7da-471b-b523-022379d92161/1931290456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e3a79f-2448-4b5b-9835-a61c20ee07c7/ioi_standby_ep_3.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdf1e6888ad70830b9d639/t/5fd633cfb1c3f31c7a7b3c2e/1607873488995/29684361782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22950641-71f4-467b-bce8-52d875455afb/tukemovir.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc529a5bd14ff0dd2b8563d/t/5fcb85f5190ee82df8de0943/1607173622384/buruvonipowuwojaripotonan.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_off0000d325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 5324 bytes
SHA-256: 64ed4d9897d6c1a09efe243c5b5978e3e69118d89abee71925f742b7d8e0f1bb
font_01_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 10748 bytes
SHA-256: 8b6aba545b834bdb391d7d2b038aa0cc07d85b39a135e9d4a0d69b2825fff700

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