Malicious PDF — malware analysis report

Static analysis result for SHA-256 f468c93e14f7df0b…

MALICIOUS

PDF

45.6 KB Created: 2020-11-02 02:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8c8b86238530e785d48521d495967198 SHA-1: 1daba1faec728880eaec57c9f6e110c0096efca3 SHA-256: f468c93e14f7df0bc3f8076060954576c6f8419de53c57b4508f0829af23d928
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, disguised with a seemingly innocuous keyword. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document also contains a large number of external PDF links, suggesting it is part of a link farm designed to attract traffic and potentially distribute malware.

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.
  • 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.
  • 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.link/123?keyword=first+tattoo+ideas+for+teenagers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5f8e3507591bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f91d87c983ee.pdfIn PDF document text
    • https://renibopasuviwi.weebly.com/uploads/1/3/4/3/134305424/4ffdbf91fb7b0.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/8451ba564.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/wibedubosateg/adjective_clause_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/6_major_physical_features_in_georgia.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/different_types_of_teaching_approaches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb9fdbc-91a7-4b8d-9229-e38a8310d2c8/70668922696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034b2af7-0219-4037-aff5-058a254b662f/ladorenufuvewepifujekosup.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/37249056001.pdfIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/persona_3_reverse_social_link_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8134b2f-959b-463a-a343-a24b6b2eafd5/80124430893.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/math_rules_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71772670-49d7-4984-9382-83abaeb7c6c7/29911578424.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_off00007349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7349 5000 bytes
SHA-256: bb3216b8a3d2f048f148e443bcf1ccbd9603a0d39b561c3f6a66a4ddb86d4d00
font_01_sfnt_off0000845c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x845C 10788 bytes
SHA-256: d962db92421aa0cad8f5fb8d8af2dcf7092dc8f8446c25f8bab7d348d1158a96

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