Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df3a36992b1f26a…

MALICIOUS

PDF

48.4 KB Created: 2020-10-08 05:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 844d954c097b160bd0ce6346bfd057f3 SHA-1: fe5e79ca36a14fab0d688aafc2212e684d892096 SHA-256: 4df3a36992b1f26a32c4b4ec348dbbaaadb087e27ed7437f1705dd106d3ab473
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://gettraff.ru/pify?keyword=download+trinus+vr+full+apk+for+free In PDF document text
    • https://site-1036918.mozfiles.com/files/1036918/rakuren.pdfIn PDF document text
    • https://site-1036884.mozfiles.com/files/1036884/bajefojenebobuvobite.pdfIn PDF document text
    • https://site-1048456.mozfiles.com/files/1048456/bimezej.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/8118492517.pdfIn PDF document text
    • https://site-1038331.mozfiles.com/files/1038331/pinomebumutavakapimur.pdfIn PDF document text
    • http://fofub.purewhiteproductions.com/uploads/1/3/1/3/131383483/4595230.pdfIn PDF document text
    • http://lomixes.jessiperrywriter.com/uploads/1/3/1/3/131398455/babibamefokelo.pdfIn PDF document text
    • http://gidak.theworshipcenterbuildingproject.com/uploads/1/3/1/4/131453247/pupijolaxuxepejug.pdfIn PDF document text
    • http://nuzodape.jjohnsonartist.com/uploads/1/3/1/6/131606295/cd7dd.pdfIn PDF document text
    • http://files.livheym.com/uploads/1/3/0/7/130776322/a448b78.pdfIn PDF document text
    • http://golevob.cecilapartments.com/uploads/1/3/0/7/130776750/494cbfe29d95.pdfIn PDF document text
    • http://rokegewen.ftjbycheryl.com/uploads/1/3/0/8/130874150/tarexugefe_kokimukuxe_xexetibojepopit.pdfIn PDF document text
    • https://site-1036848.mozfiles.com/files/1036848/20562822726.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/lusokamawix.pdfIn PDF document text
    • https://site-1039933.mozfiles.com/files/1039933/lusuwobivuva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0A 5252 bytes
SHA-256: 35105acb713652ec687908be0716f468c95bd0ace4738150fbed69591c0bcd5d
font_01_sfnt_off00007c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C17 10136 bytes
SHA-256: e83348c8b2bfba181ed09fe6dd3172516c8bd21b3958009b1a10db7fc4ea3df0
font_02_sfnt_off00009f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0D 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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