Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a333d3bd06e8938…

MALICIOUS

PDF

62.4 KB Created: 2020-11-19 23:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf65dfea7f4d4ec486bd8bc4762ba0a SHA-1: 72b4c2bf1cbb7fb5f5b105fca511edd6615bc221 SHA-256: 4a333d3bd06e893899e4a1ad97327aba31257b45d7da0df632630c0daf8a4e75
214 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://traffmen.ru/aws?utm_term=amazon+bedsheet+offer', is flagged as a known malicious redirector. The document body, though heavily obfuscated, appears to reference an 'Amazon bedsheet offer', suggesting a phishing lure. The presence of numerous external PDF links, including one to 's3.amazonaws.com/donake/super_taqueria_almaden_expressway.pdf', indicates a link farm strategy, likely to obscure the malicious destination.

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://traffmen.ru/aws?utm_term=amazon+bedsheet+offer
    • https://sifasoralut.weebly.com/uploads/1/3/4/4/134488674/fea4c924b.pdf
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/xagugalo_nikopuxuradero.pdf
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5f8e3a63e8ea3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/donake/super_taqueria_almaden_expressway.pdf
    • https://uploads.strikinglycdn.com/files/d219c8b4-2900-4298-af22-795cc857ec5a/nitukokuzitopazuwik.pdf
    • https://uploads.strikinglycdn.com/files/abd40669-2387-4d7d-b56c-0be87a5595b7/7079967046.pdf
    • https://uploads.strikinglycdn.com/files/374a4c6e-fc94-473f-96ee-586b2227e4ea/construction_management_4th_edition.pdf
    • https://uploads.strikinglycdn.com/files/b5b5d8fb-a415-41e1-a1a9-ec5164d031f6/1936198736.pdf
    • https://uploads.strikinglycdn.com/files/ab7a3356-b188-4ba8-acee-8989950de419/sample_affidavit_of_bona_fide_marriage_letter_for_immigration.pdf
    • https://uploads.strikinglycdn.com/files/81d15f67-8b58-42df-b60b-b1ced0033a36/xokoguxane.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_off0000b713.bin
dc9ddce9f3dfc58a21ca4ab042482542f68cedc0fa892205f22719dddbf0d48b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB713 5292 bytes
font_01_sfnt_off0000c8ee.bin
5091f90131190f87a676ad0590b2896d7439de64c580e526e23c7c9cff9e84fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 10800 bytes