Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0bfe76cdefdc38…

MALICIOUS

PDF

68.5 KB Created: 2020-11-25 23:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a27997b9650a13723c3d8e4022971e8 SHA-1: 1420fef1b6fe54d9207509a9b6ebe92d821e77e5 SHA-256: cf0bfe76cdefdc383be773f0c5bf2a28770eb4dfdce4796a9e21766ff8ce46de
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URI pointing to 'trafffe.ru', which is likely a malicious domain used to host or redirect to further malicious content. The document body, though heavily obfuscated, suggests a lure related to 'Steph curry powerpoint', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?utm_term=steph+curry+powerpoint
    • https://cdn-cms.f-static.net/uploads/4427501/normal_5f9997982ef14.pdf
    • https://mojipakubi.weebly.com/uploads/1/3/4/6/134679558/534207.pdf
    • https://taxamoxegira.weebly.com/uploads/1/3/4/8/134895948/vuwefadu_xuxapani_tokudafujev_wokexawagiluj.pdf
    • https://nanufuso.weebly.com/uploads/1/3/4/4/134443711/zurigeritizo.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/837046.pdf
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/4abb8c2.pdf
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fa6122262a77.pdf
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/689a43a92153.pdf
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5faf871420a19.pdf
    • https://cdn-cms.f-static.net/uploads/4372982/normal_5fbe2c3ba6bda.pdf
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f89607be28d5.pdf
    • https://xujebope.weebly.com/uploads/1/3/4/0/134018561/fe821dc497bcb2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d91a55d9-3ff2-4c28-81cd-fb27790c669b/jubemuviwupe.pdf
    • https://uploads.strikinglycdn.com/files/99d0ca0e-2f79-47a3-9a97-479d83249b69/30695423098.pdf
    • https://s3.amazonaws.com/kakekojezutok/phandalin_player_map.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_off0000ce3f.bin
1d0addbbbdd2f189ed3ad6aa91906dd9f3b93768ef7e5d695a780f85afb08688		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 4900 bytes
font_01_sfnt_off0000df01.bin
f48976d52ea1a498de5dbdef8bdbcf3db594afe3c5121b617a5e4cfb72c5b108		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 11284 bytes

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