Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbffe00ba1908ba…

MALICIOUS

PDF

68.8 KB Created: 2020-12-16 02:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 19be0d45606f899569818317e348f794 SHA-1: 24c943de32e2fa96a9e2984267d42ecd2ce7fb49 SHA-256: 6bbffe00ba1908ba55aacc3405bffb0be7461ad57494df0b7ea249f5f8e44e8b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=which+u.s.+president+had+a+middle+name+that+was+just+a+single+letter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_5f9a60a96bf4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5f8e3e6429f74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452373/normal_5fceaa826b7ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5fc18cce8eabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0ec955687f52b6b8145c1/t/5fc1027c61e25426e15bf0a0/1606484605547/sifelenano.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/botany_notes_for_ifs.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/80900557880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d254d85-44c2-40fe-a78a-b869461dcfbb/bupesetag.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce79424981a0308257053f/t/5fd5f6ba72b1137fa96ae047/1607857851288/gosovijosam.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/lulagosexokav.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/90794505883.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/84075945115.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/nixon_player_black.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c2e58ef7301f8b324c67/t/5fce1508920f47545bbaadc8/1607341325863/star_combat_online_mod_apk_unlimited_money.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/aplikasi_borland_delphi_7._0.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC01 5700 bytes
SHA-256: 3536e11fca6f57938970014ce3db4d7c2be51990d08ed5d3a3b538ba026ca8b3
font_01_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 11332 bytes
SHA-256: 14d8ba1a2d16d8b73413a4efc9276c2967c57712c4af34a50f3518aca0a91e5d

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