Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bca96cd7612a5da…

MALICIOUS

PDF

126.4 KB Created: 2020-12-16 14:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 42c635aab23c7403e527894b0b69d2e7 SHA-1: e01c0d292296b473b3d88f672d144b53f466ebaf SHA-256: 4bca96cd7612a5da6dbf4d61f49b4586a9b4bb25e3249c8a5822c94d362123ee
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'gettraff.ru'. This URL is known to host malicious content, and the ML classifier also flagged the PDF with high confidence. The document body is heavily obfuscated and appears to be junk data, but the presence of the malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://gettraff.ru/123?utm_term=manna+food+bank+pensacola In PDF document text
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5fcb765a662ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_5faf3c7b1b039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f9a455fc288d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_5fd0abb2c17a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5f98d65dec445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5f8d6d7d906b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_5fa74ef59032f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/44e28f4d-a425-4c8d-be03-8599de13f66e/rudafonaxev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee8121f-f80b-42c5-b6a1-f7000f87fc69/voxaxuvakizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080427e0-3c03-42f6-ad28-fbc76bd4949b/precalculus_vectors_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06b0d2e537a05ef0695ba/t/5fc564ef9d7936484042c46e/1606771951729/kexex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f09970f-968b-4e54-86fc-93352d7cfa73/28943398872.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29dd524b06a7eb30a4ada/t/5fc45a3ebc819f1cf463d0b4/1606703678944/phonological_feature_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/dezoxatexobebel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A79C 4920 bytes
SHA-256: bbbfc32f44d22cd96e056330205a371a32b33df108f5e8c0df297fc4af4aee9f
font_01_sfnt_off0001b86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B86F 11376 bytes
SHA-256: 3b82d46947f6c75144e62db59470d4d447c6109a713a7603f7464afa7c5b47bf
font_02_sfnt_off0001dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEA0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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