Malicious PDF — malware analysis report

Static analysis result for SHA-256 4941a800b371c081…

MALICIOUS

PDF

89.2 KB Created: 2020-12-14 02:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad9ea1edb4d6fb0e8ac4a6d1e1d8d36 SHA-1: 56c7e002b62c1deb249870abb5e244944457932a SHA-256: 4941a800b371c08144d39894e964709187b516efe3a7670e46f9e38192e7e2cf
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics indicating it's a redirector and part of a link farm. The primary URL, https://cctraff.ru/strik?utm_term=elementalist+leveling+guide+gw2, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/strik?utm_term=elementalist+leveling+guide+gw2
    • https://xawiwewediwo.weebly.com/uploads/1/3/4/0/134017039/5275723.pdf
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5fbf26fd0e019.pdf
    • https://cdn-cms.f-static.net/uploads/4468259/normal_5faa356a7d715.pdf
    • https://static.s123-cdn-static.com/uploads/4492900/normal_5fc7358e0649c.pdf
    • https://rubebipanisoju.weebly.com/uploads/1/3/4/7/134735256/1026168.pdf
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5fb7460d09800.pdf
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fc74dea319bf.pdf
    • https://cdn-cms.f-static.net/uploads/4484376/normal_5fb6d3cacbde8.pdf
    • https://static.s123-cdn-static.com/uploads/4417205/normal_5fcf809c3b8e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fekazudabo/vixifig.pdf
    • https://s3.amazonaws.com/setaxilitozuko/system_of_equations_elimination_method_worksheet_frog.pdf
    • https://uploads.strikinglycdn.com/files/de96cf42-5b8f-4bad-9e1d-c8fd0007111e/19th_nervous_breakdown_chords.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_off00012086.bin
7a4edd094e81926d197c80845702506ad6ef7ab9cac00cf57b1ccc152e743f70
pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 5288 bytes
font_01_sfnt_off00013285.bin
ff5dd79572a5001b1d349624023593095f9feb2ea1a9fe50f9e033983e938aea
pdf-font-stream PDF embedded font (sfnt) at offset 0x13285 10944 bytes