Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78a6992c335c280…

MALICIOUS

PDF

65.9 KB Created: 2020-11-04 18:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e49c3158480e032550ac0b3f1829b97a SHA-1: db55176b2f709a5d65a314236768fcf6ba6f7281 SHA-256: a78a6992c335c28075ba024071adfc1b16e7d8daf0ef361793422c417e3f482c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/123?keyword=dragon+ball+z+ending+song+lyrics In PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/xivutimumarumanede.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/7088859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f9881b498244.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/pisorevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f9b95f7b76b7.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/bfec5dae-18de-4bea-a805-8c7590e79224/developmental_stages_of_writing_preschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6bb1b69-3c1c-451f-8fdc-7c52ef8c3546/doxepepebozurugawefuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060ae9d4-8784-44fb-b799-280c815badc3/forana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8ec939-dd0e-4093-9d86-f915ce0756d9/jadagijesodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2fbcb9-32a3-46ab-9264-b822ae14cbda/99983427257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4cc444f-32b2-478f-850b-670c31b3aae9/jobejiromivaroraxosexiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df10086-718f-4cc7-b403-db7da6149b52/newasekuje.pdfIn PDF document text
    • https://s3.amazonaws.com/newopetusam/correlative_conjunctions_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/lasavonujodanekevos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44489d43-fe49-43fc-9aa7-32302d842d9c/18027566418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f11344-f235-4265-90b6-656681129b80/52485199751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86297a86-2839-4535-ad42-3ee300041268/nuvunuramojajobarulel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3A 22376 bytes
SHA-256: 9177bb3a96fdf225f1a10fe2bc66d249328c362cb1d5e1e82d1febfbfe0258d0
font_01_sfnt_off0000c2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DE 5400 bytes
SHA-256: d2f5329b1f9bf2bed19ecd12e6ecd0a116eb148aaca72cb902da9acf761a58e3
font_02_sfnt_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 10844 bytes
SHA-256: e45727614555775cd6c7a94d293109412bf56853f0b8e623da070036c372c982

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