Malicious PDF — malware analysis report

Static analysis result for SHA-256 459bf0d55dbc7b56…

MALICIOUS

PDF

73.8 KB Created: 2021-01-02 05:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63dad643dbfdb2fec816d6706bfe0d93 SHA-1: daad309f425fe465483062bc29396820e5c09cca SHA-256: 459bf0d55dbc7b56fb6878fcf66a4089c576bcdb2bb9fb2655e22a2325cd5cc2
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://cctraff.ru/123?utm_term=script+executor+roblox+download`. The presence of a "download button" heuristic and the ML classifier's high confidence score further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and linked URLs suggest it's designed to facilitate the download and execution of a secondary payload, likely exploiting a client vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/123?utm_term=script+executor+roblox+download
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/3908663.pdf
    • https://vafeperaj.weebly.com/uploads/1/3/4/5/134586379/0c659a5cbc.pdf
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/zukoxusolo-wepagop.pdf
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/zirilapalir-bisojexowesomes.pdf
    • https://cdn.sqhk.co/gewanunu/hhhfjgV/wukugek.pdf
    • https://palogipotutaz.weebly.com/uploads/1/3/2/8/132814365/kudimopu-kazube.pdf
    • https://static.s123-cdn-static.com/uploads/4447251/normal_5fe4066dc33cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jidosatikim/vafusitulasarutugiwo.pdf
    • https://s3.amazonaws.com/xupimaral/area_and_perimeter_of_a_triangle_worksheets.pdf
    • https://s3.amazonaws.com/tipakalif/cassation_decision_volume_5.pdf
    • https://uploads.strikinglycdn.com/files/daa91d28-7907-4faf-ac1b-10c5208975dc/ingenieria_en_hidrografia.pdf
    • https://s3.amazonaws.com/mipizaju/biwez.pdf
    • https://uploads.strikinglycdn.com/files/9d8e9b26-04de-4975-bb0c-bb13dc8c36ab/34273715151.pdf
    • https://uploads.strikinglycdn.com/files/7fd42e4d-1207-488e-8bd6-7cfd37e1170a/jet_promo_codes_2020_may.pdf
    • https://uploads.strikinglycdn.com/files/dd7fe3fd-7c4a-478a-a7bd-a3db5ff94fb7/fupariki.pdf
    • https://s3.amazonaws.com/bugutaj/gomitifepufibuwexogu.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_off0000e2af.bin
e9415ca9ca550cfbd9fe58f4d6c064d939ee062c4b4e755b3fca2cee3b35d52f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 5292 bytes
font_01_sfnt_off0000f4ce.bin
0ed1a735ee533ceaea23c7f864e1906cf35d5fec45a5dff53af6068cf3632e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 11124 bytes

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