Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b09fbcfba6085e…

MALICIOUS

PDF

44.4 KB Created: 2020-10-13 17:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: cac024008b8b6b80b5cf40fb2f87775c SHA-1: 468c8bdc57ee8cbcee42560cc72ee9158c8b26bd SHA-256: b1b09fbcfba6085eeacdc487fd8fa7ce2f38d0b9fbb433fbfecccd9c5d7e9de0
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://cctraff.ru/strik?keyword=a4+size+4+lined+paper+pdf In PDF document text
    • https://site-1043855.mozfiles.com/files/1043855/36452270633.pdfIn PDF document text
    • https://site-1042279.mozfiles.com/files/1042279/36990824791.pdfIn PDF document text
    • https://site-1036629.mozfiles.com/files/1036629/21238324591.pdfIn PDF document text
    • https://site-1039356.mozfiles.com/files/1039356/25376115957.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/porukofosu.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/lefilubenexewiwapesagide.pdfIn PDF document text
    • https://site-1039328.mozfiles.com/files/1039328/topirirebijunerepiremaso.pdfIn PDF document text
    • https://site-1043689.mozfiles.com/files/1043689/nurowidovugebawulomazil.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/xodalamag.pdfIn PDF document text
    • https://site-1036818.mozfiles.com/files/1036818/pedazemagojaxaxaja.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/domok.pdfIn PDF document text
    • https://site-1043939.mozfiles.com/files/1043939/loniwunubevipe.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6887 5160 bytes
SHA-256: 7a228f2ee1e13be8a4273444bdfaf6a89edfa9f4d20fdade7f5d80c98817993f
font_01_sfnt_off00007a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A27 13620 bytes
SHA-256: 83176c9f8acdf609e120b2ddc8832f55f8ee9d16a8ab259b08e3629de0199a69