Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde087fb56a759f0…

MALICIOUS

PDF

36.1 KB Created: 2020-09-11 09:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 75a9148b56de4fdbb941be32a5c84ded SHA-1: 4e29e30d30b8a431ff847ca8fccfe12a0b71ab6a SHA-256: cde087fb56a759f099b6d0d4405fed6ea568e6496f66400e14347744a813cc43
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.ru/wix?keyword=milwaukee+m12+circular+saw+guide In PDF document text
    • http://files.jburgettrentals.com/uploads/1/3/2/6/132682655/pexapikotux.pdfIn PDF document text
    • http://files.moses-michael.com/uploads/1/3/1/4/131409037/xorakutotajori.pdfIn PDF document text
    • http://files.halcyonskies.net/uploads/1/3/0/9/130969310/4980817.pdfIn PDF document text
    • http://files.irishvernacular.com/uploads/1/3/1/4/131437775/566601.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/fbcb80_944dde20902b40899797981887a6e175.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c618e9_f735ad96d14543e6b5176ad2d862ded4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4dbf3f_59114ba6cb8f4ef78703f906b746cc52.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d7ba0f_7215a748271448c8a96ae41a5ab28c3c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33078626275.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1492/9822/files/14654950975.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/ruby-_version_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0686/0187/files/fekuxorisagikurupigir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4918/7493/files/zakil.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5bb01c_1dccf09bff2a4dc8b17ec6d08865b4d2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_0a961815d397488b9b84fdf2fc6b2692.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_off00004d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D98 5604 bytes
SHA-256: 8d8f10b05e23e54206d3f716edf0bef5d17079742509ab2c24255766b5bfc50f
font_01_sfnt_off000060b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B5 10256 bytes
SHA-256: 577eec18b46e730da6fe0a29e99db967f5bcf6f07dba6c311de3fa24c1902d2e

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