Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d3b6d921009cb2…

MALICIOUS

PDF

66.4 KB Created: 2020-12-27 11:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b31d112f50320d60bb2b31fcd9290c1 SHA-1: 7ecb8c90cd6c05689a355c4f3f47f930dd4baed4 SHA-256: a4d3b6d921009cb24f16a3fac639048e080a4f5b6e43743efebf4db1799700a0
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'traffmen.ru', a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, 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://traffmen.ru/aws?utm_term=docker+repo+centos
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/wibubuto-repelesa-kijilagevi-gukufaxaga.pdf
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/2e230ed.pdf
    • https://cdn.sqhk.co/vakiduju/ohiFmjg/world_craft_dream_island_review.pdf
    • https://cdn.sqhk.co/lepapina/Bhhjegf/giwiponoka.pdf
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/rewotarudetu.pdf
    • https://ronizizuvuf.weebly.com/uploads/1/3/4/7/134707383/kumarefixudebafevo.pdf
    • https://cdn.sqhk.co/jevipugirofi/3thP8ha/ratotatilupavag.pdf
    • https://cdn.sqhk.co/sufipuxifemo/Tad4IN7/upper_right_abdominal_pain_irritable_bowel_syndrome.pdf
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5f99e8381fe12.pdf
    • https://puzamadexid.weebly.com/uploads/1/3/4/6/134640865/1544297.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavebufevodutob/fudanuziwufit.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_off0000c7c3.bin
3f22f9741380b236cb711c3a5de61f6e0f6f54b3fac3b7c1f007c4e122fef317
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 4748 bytes
font_01_sfnt_off0000d807.bin
6ad30ca5d6e8a350f6ef2f1917ae68876c705fa0189cbfed2bc3bec5d20e2470
pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 11144 bytes