Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32aa97ecad70ae9…

MALICIOUS

PDF

71.8 KB Created: 2021-01-17 20:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 162445ecbc9fa62ab298df00ca678154 SHA-1: 18ab4bf3c032f038801cd222c5e063c044f90868 SHA-256: e32aa97ecad70ae90834060ca05933173b6be127a9b8b6dbeb75934e100c0803
222 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffmen.ru'. This, combined with a high ML score and ClamAV detection, strongly indicates malicious intent. The document also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting an attempt to distribute or phish via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=chinese%20kung%20fu%202%20mod%20apk In PDF document text
    • https://wezawelo.weebly.com/uploads/1/3/0/8/130813956/5832321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5fbe273941252.pdfIn PDF document text
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/sopun.pdfIn PDF document text
    • https://site-1174029.mozfiles.com/files/1174029/jifonus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5fc480f87c937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f875625f0544.pdfIn PDF document text
    • https://site-1175951.mozfiles.com/files/1175951/road_smash_2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_5f951e94a90f1.pdfIn PDF document text
    • https://bilafewutugu.weebly.com/uploads/1/3/4/6/134619215/09171b7eac537.pdfIn PDF document text
    • https://site-1185570.mozfiles.com/files/1185570/28407662740.pdfIn PDF document text
    • https://site-1168414.mozfiles.com/files/1168414/pupajasobid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f93e4b78bab5.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/bokofapig/29554397560.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/academic_vocabulary_in_use_edition_with_answers_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/50241783435.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/6760635281.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/seraj.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/gofobapasigaroneraru.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_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 5428 bytes
SHA-256: bddd39db85b654043bb8c9d9a960172bf09eda99788a7dcc7243816905f8085a
font_01_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 13820 bytes
SHA-256: c54ffe51664a8b971ff514f9a27b16faba00745d17a73b12218dcebb30240f30

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