Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4f047bd830a9e5…

MALICIOUS

PDF

59.7 KB Created: 2020-12-16 15:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 155a60e8eceaaa427bde05ef1d9c7872 SHA-1: 1bfdd92aa5f893606b324c13a6fbc85ead555a6f SHA-256: 4d4f047bd830a9e5f21d9c92a393dc4642a8bacaacd0ffb85d9729fe984ff057
214 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links, with one pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the document's primary purpose is to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=18+wheels+of+steel+haulin+mod+bus+v3+free+download
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5fb45c55bdd6a.pdf
    • https://gukijofajileraw.weebly.com/uploads/1/3/4/3/134392650/3293014.pdf
    • https://static.s123-cdn-static.com/uploads/4369917/normal_5fc7eaac20bd8.pdf
    • https://cdn-cms.f-static.net/uploads/4390385/normal_5f93e87b8996b.pdf
    • https://cdn-cms.f-static.net/uploads/4422134/normal_5fa88d77e21ca.pdf
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5fd938551c2e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fb65d3bb-4927-4e9e-b9ca-257c229d73ca/46698098229.pdf
    • https://s3.amazonaws.com/limepusotanal/how_to_pair_logitech_keyboard_k360.pdf
    • https://uploads.strikinglycdn.com/files/e0780a05-b2c9-409d-b2be-0c1e2496faf5/34609701801.pdf
    • https://uploads.strikinglycdn.com/files/c7bc3c61-a80a-4ce1-858e-9463e92d1e1a/73267869108.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/acrylic_sheet_thickness_tolerance.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a988.bin
d7dfe4306510c3046ad5049c54c5bbe4f5a22db8938b9d77a69849a0c36fea6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA988 5752 bytes
font_01_sfnt_off0000bd12.bin
c2abab6ac548d387277cce5445dd043acb99758d7be088a676e6ce434ba31bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD12 10296 bytes