Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c436658a04b2340…

MALICIOUS

PDF

66.1 KB Created: 2020-09-28 17:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 36e771484d71b885b097024c562597f9 SHA-1: b6b221123ed9802324d9f275920ba39e93e56b6e SHA-256: 8c436658a04b23408e0a8b846808dc662dbb5885b5deb4952e7f375bf46eb92d
124 Risk Score

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 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://ttraff.ru/pify?keyword=endless+love+jackie+chan+lyrics+english In PDF document text
    • https://site-1036779.mozfiles.com/files/1036779/69438807699.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/xipujaxumuzufonuv.pdfIn PDF document text
    • https://site-1036635.mozfiles.com/files/1036635/wunitorumijosuledopoxa.pdfIn PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/24070556602.pdfIn PDF document text
    • http://bezalaba.k9rehabvet.com/uploads/1/3/1/4/131407921/ab85e0.pdfIn PDF document text
    • http://gazunud.thermage.sg/uploads/1/3/0/9/130968996/85ef1d0f34.pdfIn PDF document text
    • http://wofutu.thedreamteamsoccercamp.com/uploads/1/3/0/7/130740003/8127584.pdfIn PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/desinuwas.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/fubika.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/ruxuwuve.pdfIn PDF document text
    • https://site-1036975.mozfiles.com/files/1036975/mamijijudogazewadovix.pdfIn PDF document text
    • https://site-1036760.mozfiles.com/files/1036760/28654319996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7260/0729/files/frankel_staffing_timesheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A45 20936 bytes
SHA-256: dad0d11e2d80406d951e249b153eb886607459cae85d71dd8f702899353ef0ae
font_01_sfnt_off0000ac6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6F 5460 bytes
SHA-256: a325e7263195ae42d0ffda628951cbe7dad99a428ee089614b22b077ff15a46e
font_02_sfnt_off0000bf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF15 10912 bytes
SHA-256: 887c83de256b1b9db191f8a3b3b54611ba0986ba4bf95d2fdcabe5aed236c388
font_03_sfnt_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 16340 bytes
SHA-256: ee8b8f013b6f51ea08ae5b70d5412f202f6a9076b23c75f4a41c6f6118619bdf

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