Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eef0b5893d6bc78…

MALICIOUS

PDF

35.7 KB Created: 2020-11-04 09:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: e618f73563f8391aba44ff947d0cf9f4 SHA-1: 5902a17f3c31c79223620f5344108e7616389ffb SHA-256: 8eef0b5893d6bc78cda9827d70a640b110e0e0c11309323fb1ac8da6e8e6b251
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/123?keyword=download+big+krit+krit+iz+here+album In PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/d775903c8.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/816319e893468.pdfIn PDF document text
    • https://kotesolowineb.weebly.com/uploads/1/3/4/4/134448376/supaxoweruvofukalaz.pdfIn PDF document text
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/bubezogotarizi-vupobidej-kubuponivutosu-piraxisupil.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/7249273.pdfIn PDF document text
    • https://subulutug.weebly.com/uploads/1/3/4/3/134349811/tilimepodojezej_kujitugivube.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/39cbbd8bc.pdfIn PDF document text
    • https://guzuzixud.weebly.com/uploads/1/3/4/3/134357052/bosapitoga.pdfIn PDF document text
    • https://vajigapevinukaz.weebly.com/uploads/1/3/4/5/134578345/a59ba1b96f1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5f9235b7555e6.pdfIn PDF document text
    • https://gorijifezavu.weebly.com/uploads/1/3/4/5/134502749/wamojedonamupow.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/44917dcb-094e-425c-817c-0cc5f86089e4/viwizetugem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c22810b-3159-4d13-9de0-56d1e152b722/32093812778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c11e96b-1a7e-4c66-9560-4d88cc1b81b6/zunisawopubusatijizele.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_off00004bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BAC 5404 bytes
SHA-256: b120324f8b2d62a09470836075f1eed80ec1f539da0bbab317a0c71f48d2ef7a
font_01_sfnt_off00005e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E07 10560 bytes
SHA-256: 48107b08d9b3fcc097437a674fed59f72614ef195ac26d99b75a417788426afe

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