Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a85ef6e85137c0a…

MALICIOUS

PDF

69.8 KB Created: 2020-11-20 06:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a87058e13d0375b0cb54a76143729c65 SHA-1: 6be57bfb4c8dde445c2b490f71257e07cbf6f9f5 SHA-256: 4a85ef6e85137c0a377515f75f8051c687c53b4c2a97a50f8944cebde9650dbf
182 Risk Score
Tags
free-cdn-ebook-manual-lure

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'. The document body, though heavily obfuscated, contains text that suggests a lure, and the presence of embedded URLs further supports a malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=bs+8110+1+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/companies_sometimes_convert_receivables_to_cash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d36827-72d9-49b5-8915-f617d81e4988/sesiruxekepafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929de07c-fea0-4797-b4bf-509bf62f6d38/76170633769.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/musakuvejogijav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7db5546-17b5-4b99-907f-75c38f07cc3f/pemipuwarazeketamileb.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/free_riccar_8500_sewing_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/nuvoruxawakataped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6c6986-8e1c-4562-900f-ac982f83a7a5/jafojenixosapeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e0cebe-b7f6-4921-8576-07e1831bd616/xuzevuvisipen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c581101-829c-4a00-af25-9754526821b8/gothic_lolita_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/57124816421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3136a62e-6b43-4ba5-811a-4af47d4a6512/lis_pendens_definition_foreclosure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a4b0f8-8bbb-467d-a206-04194ab9502c/xumiv.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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 5132 bytes
SHA-256: d80197e2fb608b7143b97f7242ea1c61e054bf8ac4817df3b9c60e59db5031e8
font_01_sfnt_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 11992 bytes
SHA-256: 65b492435be46f14fc34ef0c082cc2323ba3f71c0f26251388993002615d1d63

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