Malicious PDF — malware analysis report

Static analysis result for SHA-256 f985a7a2d7f36d41…

MALICIOUS

PDF

82.6 KB Created: 2020-11-25 18:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8712f1978ae206ad2aa2e5e99f21c8ce SHA-1: 942f8cee2b011f48b0a4eb7d2557b321843c76f1 SHA-256: f985a7a2d7f36d41c06c43fae8b5160a4ed5329c259dcbf15d36c325d5bf357f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a very high probability of maliciousness. The embedded URL, https://cctraff.ru/strik?utm_term=behind+the+neck+headphones+reddit, is the primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://cctraff.ru/strik?utm_term=behind+the+neck+headphones+reddit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_5fb2f5d09765d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_5f9fd6538389c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5fa908aeedc9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5f9845f4c22c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_5fad32f93cd55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f9157440aa67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_5fada4a2da504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fad765d1788d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403676/normal_5fb948bf59fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f90866d0d7ad.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/mudurixo/65331284302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1e87d6-8806-4a5e-be38-70f4865b4b24/88610493893.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/58591200259.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/everybody_loves_raymond_cast_amy.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 5244 bytes
SHA-256: d18eaeb775df1f899bb70711b337dc97658b487dcd3d66f5e77871d9c5f08f26
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 10756 bytes
SHA-256: 01c7ff4748f349ac5d6a4246c4699a4f33ba995f0c1b69817a3a535966b8e578
font_02_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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