Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b793bbb607e759…

MALICIOUS

PDF

39.0 KB Created: 2020-11-09 04:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 9452644b8b46f7733e3bc4b8c7b7c191 SHA-1: 611767ccceef781516f76db89531bc317f7c88d5 SHA-256: 99b793bbb607e759219d023e2b508647db37e45bf7e7f8a1ce5f19e972ef4f1e
184 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?keyword=bauder+elementary+florida In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_5f9f05d57d354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_5fa76b3f615c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bexaxul.files.wordpress.com/2020/11/62957363560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8e6c05-6e5b-464f-ac50-4109939fbd00/tubibunujorivarawu.pdfIn PDF document text
    • https://fefitaw.files.wordpress.com/2020/11/64939725781.pdfIn PDF document text
    • https://bikulaw.files.wordpress.com/2020/11/bajekupexu.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdfIn PDF document text
    • https://fovodifikade.files.wordpress.com/2020/11/45950072182.pdfIn PDF document text
    • https://rewitaxiji.files.wordpress.com/2020/11/detective_conan_movie_22_full_movie_eng_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27163a0-74c3-4ade-ab5b-4c85f6bc5cf2/wisor.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_off00005b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0A 5024 bytes
SHA-256: e4b1740f8d5f4b2648de15356b0b285144113bd8bc9d5b08921b031dd045f4a0
font_01_sfnt_off00006c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C17 10540 bytes
SHA-256: 72bd805ca29f13f53d91e3b0496177c9ebc7b1d676e229c5d0554a4604182681

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