Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e598b935d01c9b…

MALICIOUS

PDF

34.7 KB Created: 2020-10-02 11:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1b3779d48456e5f53e2daca050282156 SHA-1: 4c72338dc6c7032b7add5983deefaeb8b2094e93 SHA-256: b2e598b935d01c9bc3864fbe792f09def807488199613e3e5e7fd603bcafe7ae
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, suggesting an attempt to trick users into visiting a harmful site. The document body and embedded URLs are consistent with a phishing or scam lure, likely using a 'Spearphishing Attachment' initial access vector. No scripts were extracted, but the ML classifier strongly indicated maliciousness.

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=everfi+answers+lesson+3 In PDF document text
    • https://site-1038749.mozfiles.com/files/1038749/kopile.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/26276240908.pdfIn PDF document text
    • https://site-1039768.mozfiles.com/files/1039768/20308466143.pdfIn PDF document text
    • https://site-1038669.mozfiles.com/files/1038669/62329458695.pdfIn PDF document text
    • https://site-1036886.mozfiles.com/files/1036886/sotizexugepimaji.pdfIn PDF document text
    • http://files.sirocksny.com/uploads/1/3/1/6/131637056/sodadetufez_xesajuvuxuz_fowitemipemalax_rurowiwok.pdfIn PDF document text
    • http://vanok.healthyroots.info/uploads/1/3/1/3/131381088/6011906.pdfIn PDF document text
    • http://files.prbydenise.com/uploads/1/3/1/3/131379329/nonoxenojulok.pdfIn PDF document text
    • http://vuselun.kidslearnliberty.com/uploads/1/3/1/4/131453194/f0a5e64d.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/dc8fbaf5-e920-4a60-ba6e-e682f92ea3fb/80207239327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a44b6d-ae41-4b07-90ff-a85e73569c6a/kutewuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043da76b-1de0-4bfe-8187-b51d4826e243/batufugumome.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_off00004cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CBF 5036 bytes
SHA-256: 0597a7289ee1f901a71fb6c9be31305c9eef3021e3864c0afb5763168243222f
font_01_sfnt_off00005e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0D 9356 bytes
SHA-256: 3c04e60ac172aba08b7463c811ab907cc274a4d1c14bce127424532b8e6c0627

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