Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f775b3d952aa60b…

MALICIOUS

PDF

68.6 KB Created: 2021-01-10 21:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72120e6f93de3f41bdc97c80b5f32867 SHA-1: 78965d5030d7f34b33d4bdfbcbec228a25b27da3 SHA-256: 3f775b3d952aa60b4530d0bd13969e998225cd37b9db5dffa715dfa8d6c0e8c2
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded links, including one pointing to known malicious redirector infrastructure at `https://traffmen.ru/123?utm_term=momentum+and+impulse+problems+worksheet+answer+key`. The document appears to be a link farm designed to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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.
  • 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?utm_term=momentum+and+impulse+problems+worksheet+answer+key
    • https://site-1168222.mozfiles.com/files/1168222/the_impossible_quiz_unblocked_games.pdf
    • https://site-1174269.mozfiles.com/files/1174269/wizard_of_oz_munchkins_cast.pdf
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/govelupobusufop-gedozonaxenulu-xonere-netarawigi.pdf
    • https://site-1173944.mozfiles.com/files/1173944/77700214679.pdf
    • https://cdn.sqhk.co/faruzikako/gehdDib/seduwizizezabedag.pdf
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/zamebabelixixomozosi.pdf
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5f94decdc42fd.pdf
    • https://site-1175023.mozfiles.com/files/1175023/zafuregopamekal.pdf
    • https://site-1172681.mozfiles.com/files/1172681/can_zigzagoon_be_shiny_in_pokemon_go.pdf
    • https://cdn.sqhk.co/fixiwuwukufi/iaJgiLX/defuse_the_math_bomb_3d_apk.pdf
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/af8f828052e60.pdf
    • https://static.s123-cdn-static.com/uploads/4466673/normal_5ff379cd765a8.pdf
    • https://site-1179273.mozfiles.com/files/1179273/worizofadizuzavuga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d01c.bin
ab8a24dced84e7ff387e225f8b604dd9c3a10982079f6b030556a78641ce724b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 5604 bytes
font_01_sfnt_off0000e313.bin
72fe0435888daf44d934dbb4a4c81240dbc6dd219e23a2c2a4d0cc1b5d1d1971		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 10072 bytes

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