Malicious PDF — malware analysis report

Static analysis result for SHA-256 317defc3957bad52…

MALICIOUS

PDF

43.8 KB Created: 2020-11-03 10:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f5585088ecfab72a2d704f5cf5370b57 SHA-1: 5a27d0edb014f166fc4fc27a74e50ef7c931f8b2 SHA-256: 317defc3957bad5259ae4e0f2062eab8255e6985b30d258629a289b132359845
94 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL is disguised as a search result for a popular torrent, likely to entice clicks. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary malicious action is the redirection to a harmful URL.

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://cctraff.ru/aws?keyword=american+horror+story+torrent+season+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5f8fc064beee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_5f990bbea108e.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/505f66e7-2078-4923-a5ee-814e28bd0ff8/the_non-designers_design_book_robin_williams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafff1d1-9fb3-458d-9dac-b25977d4e1b5/tewidoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929b9d36-1407-497a-ab53-70166bed4e7a/shark_pro_steam_pocket_mop_vs_genius.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fded7e92-b539-40fe-ad43-fd8a115d463c/21115107328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86b0a62-bfba-41bb-8244-930a6a64a4f3/fagerilomuzejokin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0fef39-d209-4c82-81bc-4a8c45fdb2ba/all_about_me_worksheet_for_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/college_board_sat_practice_test_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acb6391-338b-454c-98ba-01bcd1d47abb/gaxagababixudado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b28fe61-6f5f-49c8-b329-a30ac5ee62d4/scary_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764732f1-f29b-4e04-97af-ae66a0a98887/fexakalawemiwunor.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/84_hatha_yoga_asanas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6cc7515-2758-4015-89f6-fc0c90c64e1e/desabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e1ea5c-6ad6-47ad-a3d2-c7761fd7634e/nimedatozamafedetojol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3824bb-a7b4-4bec-ba64-5c9e731f6fb7/82568905992.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_off00006c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C27 5152 bytes
SHA-256: 4f7cb4ef24b7d871c9435249f682e6cf0cb031130c0477fdec4b0330edacbd40
font_01_sfnt_off00007d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D87 10656 bytes
SHA-256: 65e9683e8614af01b2965a4fec18e9e2aeb77e13c22dc64ae2987707c4a3941d

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