Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b87b50de12e795b…

MALICIOUS

PDF

67.7 KB Created: 2021-01-13 13:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 25cd14035a8b7dcfe41b507d0639ac8a SHA-1: 92ad68f27deaa8abfdf16312ea613598be4b549c SHA-256: 7b87b50de12e795bc1a5b75c886c886ab6086421bd9b1810e4ce6e8cb5854cd7
192 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'ggtraff.ru'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains elements suggesting a lure related to 'anti social behaviour noise' and urgency, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?utm_term=report+anti+social+behaviour+noise In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_5fa01ff427571.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/tutuxoresuvefo.pdfIn PDF document text
    • https://site-1176655.mozfiles.com/files/1176655/uber_driver_app_login_problem.pdfIn PDF document text
    • https://site-1175279.mozfiles.com/files/1175279/lidorokuwogevoloxugoniser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f9f33509a791.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/91589a4002ecbcb.pdfIn PDF document text
    • https://cdn.sqhk.co/daboxazile/FhrhdRm/programa_vida_saludable_sep_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_5fb98a56b2235.pdfIn PDF document text
    • https://nakefofomiruni.weebly.com/uploads/1/3/4/4/134483242/jevonorasiwokiran.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/xisakazelelinim/the_mousetrap_car_physics_analysis_report_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/asos_shoe_size_guide_australia.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_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 5228 bytes
SHA-256: f19a2629a97af9585e8264b86202cd787ffa493d8a8aef5bec9aaab64925daea
font_01_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 9788 bytes
SHA-256: 85c4e3a17e74149871edb2dc8f1c429d3b306e42e79184ebd7c076f254bd0ab6