Malicious PDF — malware analysis report

Static analysis result for SHA-256 33eccf7f6361ed4a…

MALICIOUS

PDF

46.4 KB Created: 2020-11-05 08:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73f912aae270022676e07b2f4a5e3c01 SHA-1: 624b32c5fad3526ae0db4713015f4ca0ff6d5144 SHA-256: 33eccf7f6361ed4ae41a6e79368c63a79d651d3d1bd2a03e95eb018ce4ca2c61
102 Risk Score

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://gettraff.ru/123?keyword=electron+cloud+model+picture'. The document body, though heavily obfuscated, also contains this URL and other benign URLs, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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://gettraff.ru/123?keyword=electron+cloud+model+picture
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5fa17e2c0f60a.pdf
    • https://cdn-cms.f-static.net/uploads/4383702/normal_5f90c5f17e1c7.pdf
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5fa0cd69761b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jifesu/baxter_robot.pdf
    • https://cdn.shopify.com/s/files/1/0496/6003/5235/files/baixar_apk_assistir_tv_online_2020.pdf
    • https://uploads.strikinglycdn.com/files/13f79ef5-01f3-47ad-a203-bf2d86102f6a/9955840570.pdf
    • https://uploads.strikinglycdn.com/files/0698f980-203c-4837-ab41-a7c68eae59c2/15750650507.pdf
    • https://s3.amazonaws.com/zedilegol/crack_serial_number_abbyy_transformer_3._0.pdf
    • https://s3.amazonaws.com/henghuili-files2/tcs_technical_interview_questions_for_cse.pdf
    • https://s3.amazonaws.com/zetare/pumikix.pdf
    • https://uploads.strikinglycdn.com/files/3366cffe-819e-4634-961d-3c593b2d8328/33837602123.pdf
    • https://uploads.strikinglycdn.com/files/b8f217a2-6995-4c53-b80a-a02be49d906a/822726323.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_off00006ff6.bin
47cc50aa264dfae5fd52c7d49629f1229e0b0ad17e42442efdc87ae4c3c91489
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF6 4788 bytes
font_01_sfnt_off0000802c.bin
3d518acd92963ef2502a3c861012e2d26ae484e55b1b25e2cb4e8571cbb6b62a
pdf-font-stream PDF embedded font (sfnt) at offset 0x802C 15328 bytes