Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1bc7ecfaf69d14…

MALICIOUS

PDF

72.0 KB Created: 2020-12-15 23:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d7a285a048afd23e51328254afefc80 SHA-1: 5cd291e29cdfd9fce4517ef268bfc94d25dc8e44 SHA-256: cf1bc7ecfaf69d14fee3ced3126805f98a29056ebc73c4746b04ef05fa6217a9
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'kung fu chaos' and appears to be generated by wkhtmltopdf, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=kung+fu+chaos
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/df2efbbdfd.pdf
    • https://cdn-cms.f-static.net/uploads/4475995/normal_5faab2b02bae7.pdf
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f9d9d048101d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e110403f5353fd95a22f/t/5fc14a54f8cdb769c6132430/1606502997595/fearless_itv_season_2.pdf
    • https://static1.squarespace.com/static/5fc0e8305687f52b6b812c21/t/5fc12a413570fb44d12cd99a/1606494785444/morongo_indian_reservation_map.pdf
    • https://uploads.strikinglycdn.com/files/7017b083-de66-4c0e-8e47-0a9462a6bc46/60457466070.pdf
    • https://uploads.strikinglycdn.com/files/41c88e6a-dd8c-4c83-a96b-3292a97b8a8f/94048830420.pdf
    • https://uploads.strikinglycdn.com/files/e13c5c33-fb01-4b34-9432-b6003d678dcb/xafolojoxa.pdf
    • https://uploads.strikinglycdn.com/files/60fd559e-52b5-46f9-8f76-0633067a84ca/kepaluzaxilur.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd32e0376c5c1e4b98458a/1606234849323/settlers_of_catan_printable.pdf
    • https://uploads.strikinglycdn.com/files/8e2c3bd1-f6d8-4fa7-b25d-941c1f0178c1/apk_editor_pro_version_1.8.6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24e.bin
8bb5458e9945fccc0b4d535ed5c32d96110bdb9e1ac6c62337c8ee9e68e437e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 3132 bytes
font_01_sfnt_off0000dd66.bin
9d7c1fa3bd41d0ec416b0ea8938680a7463a94e728bf16e29c00e9484437ec0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 4984 bytes
font_02_sfnt_off0000ee73.bin
a87f066d5e74fb87e9a13ff5dc5c2b2f4da3a05da8adad6a5524c4a52648cc0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 10840 bytes

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