Malicious PDF — malware analysis report

Static analysis result for SHA-256 a426af7366abd017…

MALICIOUS

PDF

36.5 KB Created: 2020-11-09 15:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 74579aee478b81af80116e4e803ccba2 SHA-1: 48c68ec5e7fdd9383858388340dec9c3aab9114c SHA-256: a426af7366abd017bfbe135189a1cf305292f009149f69834661c37eae90a490
94 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://traffking.ru/123?keyword=math+1331+ttu+final+review'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the redirector suggest an attempt to lure the user to a malicious site, likely as part of a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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://traffking.ru/123?keyword=math+1331+ttu+final+review In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f877d1942735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f89dabf0a04f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/warriors_for_christ_bjj.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/calf_tear_rehabilitation.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/delelepumuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc11131-d9f4-4f42-8f18-59401fc8d0b3/416513909.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/nejedokumusu.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/transition_soccer_drills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c070f1d-583c-4244-bd5d-62c2fb3d0a1d/zexaresugaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53caf0a-182f-45f5-b051-641174c1ba76/tiwelozuxoxilabutudalatem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa91862-02cd-4cc9-9cee-4f87485750a6/z-edge_dash_cam_front_and_rear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3eb9834-aa83-4b0b-998d-5c341b51be52/nigowezodipotaso.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/eldorado_elementary_school_santa_fe.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/center_of_gravity_test_men_vs_women_chair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f2e8e2-fdc6-46fa-9e7f-f09c60f828ad/xebiwekutiwofekuvifiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3365c42a-67ea-42b1-ba4f-64e84098d4ef/figurine_of_wondrous_power_silver_raven_5e.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_off00004ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE8 5048 bytes
SHA-256: 48d1df43762657f02996f4b84e6f22fc4b3c2464ffa8bf801ac001b5b71e3bbe
font_01_sfnt_off0000603a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x603A 10576 bytes
SHA-256: 2e6df43ecbdc80f589c084b3a125001b1856d3b97d5a4fd3c396e2e62899f985

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