Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da40682c141c49e…

MALICIOUS

PDF

70.4 KB Created: 2020-12-24 04:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9010e8e57b6f88fc0a38dd1cd58110b9 SHA-1: 27ea7c7ea53f262c33b08591c3ceda4b9d9d6efb SHA-256: 6da40682c141c49e49b4296e2d5185b7f61bc44dc9d87f659595df2f71554546
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with one critical heuristic identifying it as a redirector link to 'traffmen.ru'. Another heuristic indicates a PDF link farm, with one URL pointing to a benign S3 bucket but others likely serving malicious content. The ML classifier strongly flags this PDF as malicious, and ClamAV detects it as 'Pdf.Phishing.Trojan'. The presence of a download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=the+avengers+destroyers+mod In PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/vovisep_xozirotos_wipagodazezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5fd1f1db8828a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5f8a5e46b7271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fc3691173123.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/3444101.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://s3.amazonaws.com/dibedamoka/c_crystal_report_without_dataset.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/iir_filter_design_using_bilinear_transformation.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/purubamirizodadobu.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/9181702887.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/uhn_febrile_neutropenia_guidelines.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_off0000c8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F3 5060 bytes
SHA-256: 7d1cd3421017591520adec003dfaa5a473032cffadb4df6940c285d9aa7a0d79
font_01_sfnt_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 10684 bytes
SHA-256: 0e4af45b8d3dfb118caf2a802f773496dca89b6e5330071dec0dc671867b86f5
font_02_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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