Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d261cb880b41e5…

MALICIOUS

PDF

41.7 KB Created: 2020-10-11 03:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b9b77ac136f4b802f2f34dbc6b616d41 SHA-1: f8b88f2ee501b96d58b950deffb4297d2d307c43 SHA-256: 51d261cb880b41e5eff2185b535d9d200b07e0eb52d390df8fda049cc3dc134f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to disposable domains, with one specifically identified as a malicious redirector pointing to 'https://cctraff.ru/strik?keyword=citibank+drivers+edge'. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly indicate malicious intent.

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=citibank+drivers+edge In PDF document text
    • https://site-1036832.mozfiles.com/files/1036832/58276036946.pdfIn PDF document text
    • https://site-1039320.mozfiles.com/files/1039320/27241228307.pdfIn PDF document text
    • https://site-1038794.mozfiles.com/files/1038794/95981424056.pdfIn PDF document text
    • http://kadezimuz.katarplatformu.com/uploads/1/3/0/8/130814328/a7c3e4796a14.pdfIn PDF document text
    • http://gebigijal.northwestdogretreat.com/uploads/1/3/0/8/130814526/07497681344f1e.pdfIn PDF document text
    • http://voxawe.lahainalunaptsa.org/uploads/1/3/2/6/132695399/3727788.pdfIn PDF document text
    • https://site-1039271.mozfiles.com/files/1039271/46465150965.pdfIn PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/pefizodipulegutujisajetop.pdfIn PDF document text
    • https://site-1039514.mozfiles.com/files/1039514/18714240389.pdfIn PDF document text
    • https://site-1038739.mozfiles.com/files/1038739/kimilubetopevoxekif.pdfIn PDF document text
    • http://files.katherineboener.com/uploads/1/3/1/4/131452922/zerisiwolenivaz_vezajevo_vaxowad.pdfIn PDF document text
    • http://teluzu.nicolemiao.com/uploads/1/3/0/9/130969844/e4fcab5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off000058d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58D1 4924 bytes
SHA-256: a74674f2971a135b9f08a9861434ec8d7f25a2badc918be0ad98a27b5e1d9bad
font_01_sfnt_off0000699f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699F 10176 bytes
SHA-256: 2b8191eccde9fa66a443b276b818572f51ef842c7481a65a1cd25f96a677bf3d
font_02_sfnt_off00008c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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