Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e07f70463da4e47…

MALICIOUS

PDF

68.1 KB Created: 2020-11-10 20:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 858f8e93102a5ddbc41950dddd3d137d SHA-1: 59557bb9674f22964d108311d53a02f1fe63ed12 SHA-256: 3e07f70463da4e4717dc5d2d520ac11ff5b4d3e81d35e01e1efeb7a056cc7fb8
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffmen.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one to an S3 bucket. 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/123?keyword=battle+of+the+sexes+questions+for+girls
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f9f6b26cf9b4.pdf
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/sirelogabiruxikodas.pdf
    • https://cdn-cms.f-static.net/uploads/4408596/normal_5f9ef2f7b9319.pdf
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/norudinuzu_viteto_tejolil.pdf
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5f9ddaee2fd99.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f8f72768ae56.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/varoximu/imperfect_past_tense_spanish_irregulars.pdf
    • https://s3.amazonaws.com/dusined/80725401590.pdf
    • https://s3.amazonaws.com/bofake/dmv_practice_permit_tests_2015.pdf
    • https://s3.amazonaws.com/mozirolinitaje/linetuxavav.pdf
    • https://s3.amazonaws.com/mewezekilafef/lizemawoseg.pdf
    • https://s3.amazonaws.com/mijedusovineti/98600752720.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_off0000ce25.bin
fb29900c1a6ae7299381b8defd3693badd4d0d88ce698ed709b640c149af15c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 5272 bytes
font_01_sfnt_off0000e015.bin
f73a6d271af4d93dcd1212cf9f77ee66ac54ea96651ada68525d251d0e79ce12
pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 10436 bytes