Malicious PDF — malware analysis report

Static analysis result for SHA-256 079a4690e8e68c51…

MALICIOUS

PDF

96.5 KB Created: 2020-11-11 03:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b56a58e49bca52403d4a0fa4766af73a SHA-1: f258f464ef6d72db1580cb44f90b890aa9cdec9c SHA-256: 079a4690e8e68c51953f45a315e91a060388a548af8cf64dad0570effd6c2ab8
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ggtraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, suggesting an attempt to distribute or redirect users to further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?keyword=captain+yamato+death
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f91ecdc86829.pdf
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f9585ad10efc.pdf
    • https://cdn-cms.f-static.net/uploads/4450138/normal_5fa49284cd206.pdf
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/galomipiwajilimepude.pdf
    • https://cdn-cms.f-static.net/uploads/4481173/normal_5fa97f3a57b01.pdf
    • https://cdn-cms.f-static.net/uploads/4447095/normal_5fa6288c6d95f.pdf
    • https://cdn-cms.f-static.net/uploads/4417145/normal_5f9c5315914fe.pdf
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/4bec0a78d177e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zetare/18628183212.pdf
    • https://s3.amazonaws.com/fosagoba/adp_api_cost.pdf
    • https://s3.amazonaws.com/bededuxotulapil/chapter_10_maths_class_10_download.pdf
    • https://s3.amazonaws.com/subud/71803753568.pdf
    • https://s3.amazonaws.com/luxelula/how_to_succeed_in_university_exams.pdf
    • https://s3.amazonaws.com/purawuma/description_structured_interview.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_off0001406f.bin
e7bdc6a78cb8490d20ee1bf9ea4e7374199bb41a167589d5b089e464e9e1614c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1406F 4900 bytes
font_01_sfnt_off000150fb.bin
6fbe8ab38c06ff12c50aa7bb4aa38797cc48dbd84506b8a55b0906d994b3f777
pdf-font-stream PDF embedded font (sfnt) at offset 0x150FB 10764 bytes