Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9faa19686109a21…

MALICIOUS

PDF

34.3 KB Created: 2020-10-10 00:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 28f788f2511aefce3819eb1fa3926250 SHA-1: 614962ae264f504b34d253c628d6edb51d69beeb SHA-256: b9faa19686109a2191edc3d4ffcad483c9f18bcd12f986523f7905d57627c3fc
154 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which, 'https://ggtraff.ru/strik?keyword=trapped+in+my+mind+kid+cudi+lyrics', is identified as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to malicious infrastructure.

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://ggtraff.ru/strik?keyword=trapped+in+my+mind+kid+cudi+lyrics In PDF document text
    • http://wabej.fbcgodfrey.org/uploads/1/3/0/9/130969465/a6112.pdfIn PDF document text
    • http://files.aplitlounge.com/uploads/1/3/1/4/131437174/sokefiguguje_xaxasipojilije.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/0434daa8-e695-428c-8b20-b737e223fd48/60674073121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ffbedc-77fb-4992-8661-dd3b508ea947/vuxovupofizixido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560d0c4d-90c4-4872-944f-d204ffa047a3/99616418712.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0741/6219/files/closed_for_the_season_sign.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/lixof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/zesez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/dd_death_domain_deities.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0158/8123/files/fafulijin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/rudder_middle_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0670/4290/files/68102806182.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_off00004a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A28 5336 bytes
SHA-256: 0a0f2ef40c327da6c9bb8049748cad5a61c62183efb6f27a520de08ed9fa9e4a
font_01_sfnt_off00005c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C40 9544 bytes
SHA-256: ddd2a50c8beb7ebb9f0acd1d1ee30fcaa93c5a5673e586ee0e71a3ec374f020b

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