Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9117d41777caea2…

MALICIOUS

PDF

32.8 KB Created: 2020-10-03 12:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 331e5d9903a188da49a1fb948f966d8b SHA-1: 76064956a2b51d2df16ef56670ff0a3fa9b0b96c SHA-256: f9117d41777caea2a5a283c8a23b104aadad29a72ed99580af504f8c649a07f2
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, specifically `https://ggtraff.ru/strik?keyword=mrcog+part+1+success+manual+pdf`. The document body, though obfuscated, also contains this URL, suggesting a lure to trick users into visiting a potentially harmful site. The ML classifier strongly indicated maliciousness, and the link farm heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?keyword=mrcog+part+1+success+manual+pdf In PDF document text
    • http://files.sayfguard.com/uploads/1/3/0/7/130775431/gajated.pdfIn PDF document text
    • https://site-1036902.mozfiles.com/files/1036902/8019095070.pdfIn PDF document text
    • https://site-1038475.mozfiles.com/files/1038475/xatojowikoreviv.pdfIn PDF document text
    • https://site-1042602.mozfiles.com/files/1042602/duripuxexufav.pdfIn PDF document text
    • https://site-1039847.mozfiles.com/files/1039847/datitiz.pdfIn PDF document text
    • http://files.soundslikechris.com/uploads/1/3/1/6/131636969/rageg.pdfIn PDF document text
    • http://files.unionvibeent.com/uploads/1/3/0/9/130969992/femibunoboke.pdfIn PDF document text
    • http://zobov.nancychartierstudios.com/uploads/1/3/1/3/131380001/binemod_zipeseku_javuvijo_simebupoxofitaf.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/c76667d4-e59f-4424-9364-0e594f07c633/58894934063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af8bc5a-b177-48c3-a432-fb0e867ddeb4/fopemixabuleres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68f57b0-6c55-40c2-9572-3c12883362df/vifejabaletukuw.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_off00004157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4157 5532 bytes
SHA-256: 44380b21feb7010aa00134be5b6d038513e3d2a5e99577c7b50c6671b3ed3110
font_01_sfnt_off00005424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5424 10364 bytes
SHA-256: f9be49dfd89032e20c3c41daeea58e2f02a7a69f75771e4f3772d5a547afcc0c

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