Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9823430252dba8e…

MALICIOUS

PDF

77.9 KB Created: 2020-11-27 17:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a60427ffd4afdbef30b25ca3abea3e72 SHA-1: 1daabf6a4b034e9b44b4aa9b3d8a1623d262b4b1 SHA-256: c9823430252dba8e798e80f3c354deb0e39df2ba0842811f632dd5c44dd0429c
154 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'. This URL is likely used to redirect users to a phishing page or download further malicious content. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious purposes.

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://traffmen.ru/strik?utm_term=desert+diamond+sports+betting In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fb80270a361a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5fa42e34591e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5f9b976f504d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451742/normal_5fb896956e93b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f9face774c86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_5f95cca07be9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18d83aa-9441-422f-bc12-d56a275a8b99/balanceo_de_ecuaciones_quimicas_por_tanteo_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d01a17-6627-452d-b18d-75159a70fada/2014_chevy_captiva_ltz_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf90047-bb87-46b2-91d7-9c12b2949f68/kapobiwebopom.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/domonuwepipawerixi.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/17819397849.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/nuwokomorojivimukiseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2805c118-4cb9-470d-9a1f-8452312908b8/nexygen_plus_software_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/black_friday_movie_hd_quality.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_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 5388 bytes
SHA-256: 143da4f1ef0630c796fa5399ba2a9f403e53dcb4678cacca2ccf461407927f4b
font_01_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 10880 bytes
SHA-256: 507ff2838601864483ac397f42652aecaa23d3ab6648a496fba72f36fd0a648d

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