Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8b774b08ff38d2…

MALICIOUS

PDF

42.8 KB Created: 2020-11-02 18:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b69641cf96b022130be173c2b9502691 SHA-1: d82ce17bda9f8a21bede4dcd8e4ea2152538490b SHA-256: bc8b774b08ff38d2e7dfd01c337286e0fa09906891816a11918bf798cbca1b48
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is associated with malicious activity. Additionally, a 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a shell, suggesting an attempt to trick the user into executing commands. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://ttraff.ru/123?keyword=photoshop+cs5+keyboard+shortcuts+for+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5f98a2cb0f850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8717803e3b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f8a2672440af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5f9139ed7d842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f8e227b0680d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8b150fe076b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9567f6f-d8b0-4380-87c2-9cfe84f42e07/riwutibuwozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/mascoutah_boy_scout_troop_577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90aafef0-5929-49e1-98dd-25f8fa7cdd38/55599074801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c715b45a-e2b5-44d7-9070-ccf724f1f414/21507543930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4335/5293/files/all_video_downloader_apk_in_computer.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_off0000666b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666B 5644 bytes
SHA-256: 216f3cc96649896ae707929b8354714d3b1d0fa6f69505b94178d341c3d03a5b
font_01_sfnt_off0000799f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x799F 10940 bytes
SHA-256: 470c538812107e412b98bbf843e388691f4016f3679a7d6ed446d9557b6da6de

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