Malicious PDF — malware analysis report

Static analysis result for SHA-256 919938cbcf96317d…

MALICIOUS

PDF

206.4 KB Created: 2020-11-24 17:07:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5917eb94c67cf759c34d67734b208417 SHA-1: 552d42bf9c40fd4f58d5a7d62876f87c92d8ebd0 SHA-256: 919938cbcf96317d89797d89a87def66db372c5041ba42c79147fa97891e9cc5
194 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also returned a high confidence score for maliciousness. The presence of advance-fee scam language in the document body, combined with the malicious URL, strongly suggests a phishing attempt designed to defraud the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://gettraff.ru/strik?utm_term=phrase+wheel+of+fortune+6+words
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f8a95ab5d264.pdf
    • https://cdn-cms.f-static.net/uploads/4426410/normal_5f9b8f434758f.pdf
    • https://cdn-cms.f-static.net/uploads/4454422/normal_5fb00f5d13b31.pdf
    • https://cdn-cms.f-static.net/uploads/4424997/normal_5f98709713352.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sugaguxagu/dokonivediroxojavidiv.pdf
    • https://uploads.strikinglycdn.com/files/d1f2ea3e-1c3d-4f61-9991-a3cef0c1a431/faluderuromedenugonutejug.pdf
    • https://uploads.strikinglycdn.com/files/6cd42010-10df-49f0-9944-7cc035cc93bc/18792233729.pdf
    • https://s3.amazonaws.com/bifamomove/recycled_glass_cake_platter.pdf
    • https://s3.amazonaws.com/rizezobabub/learn_biblical_hebrew_jeff_benner.pdf
    • https://uploads.strikinglycdn.com/files/baaa9850-8d4f-46d9-a98f-8f296e0dd98e/58250074917.pdf
    • https://uploads.strikinglycdn.com/files/717ad2ab-1857-4386-8bb9-89915d6df29d/duveju.pdf
    • https://uploads.strikinglycdn.com/files/267d7bc9-6a98-4070-abd7-cded3d643d4b/2018_honda_goldwing_service_manual.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_off0002f13f.bin
7fb26df2f3843bc1be7bde650dc1182d119725d835ace3b749bb2d2a8e002efe
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F13F 5240 bytes
font_01_sfnt_off00030320.bin
f9d4254d6dcc1a2a58292a5bb92a9180e6d122db63661398c7406e6bb27d9733
pdf-font-stream PDF embedded font (sfnt) at offset 0x30320 13716 bytes