Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4fd1b21fada1bc…

MALICIOUS

PDF

36.9 KB Created: 2020-10-08 00:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-04-03
MD5: 0648ae820cfd99e277336d82fbe219a2 SHA-1: 9975e0b8b3febc182cd01a1b9888f1b20f264a09 SHA-256: de4fd1b21fada1bce392ddfba12f5c10a68b08a0b42a2799d1b3eded72c3465d
132 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body itself is a lure, presenting itself as a piano sheet music tutorial to trick users into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=di+lang+ikaw+piano+sheet+music In PDF document text
    • https://site-1041491.mozfiles.com/files/1041491/vegusupinixobidare.pdfIn PDF document text
    • https://site-1038409.mozfiles.com/files/1038409/71140616692.pdfIn PDF document text
    • https://site-1037273.mozfiles.com/files/1037273/76074166456.pdfIn PDF document text
    • https://site-1037011.mozfiles.com/files/1037011/jukej.pdfIn PDF document text
    • https://site-1037142.mozfiles.com/files/1037142/moxevebaze.pdfIn PDF document text
    • http://xufadozi.uccellos.com/uploads/1/3/2/8/132814930/nipuwozovixinifad.pdfIn PDF document text
    • http://gebexe.atozsmallbusinesservices.com/uploads/1/3/1/4/131406837/9461355.pdfIn PDF document text
    • http://moruduz.akidsplace-huntingburg.org/uploads/1/3/1/1/131164392/donetubof_puwuxafes_rutux_vadufetin.pdfIn PDF document text
    • http://rufunuvur.cathyskendrovich.com/uploads/1/3/2/3/132302966/lupazux.pdfIn PDF document text
    • http://files.sandylien.com/uploads/1/3/0/7/130739194/08391.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005104.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005104.bin)
    • https://uploads.strikinglycdn.com/files/d089d4c0-5b24-422d-b4bf-764c4306d717/9542351200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a00662c-cb9e-493b-8df7-60e81e7bec69/kejupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780b2bec-fa53-4952-9f1e-d2f38974bfe0/42083590620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1cc2d9-3a86-43d6-8b2d-a3a5dc57bfff/ligokavanojoxibimifokif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a83638-8284-4b77-8c0b-06372aa01579/22584935208.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 extracted file (font_00_sfnt_off00005104.bin)

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5104 5408 bytes
SHA-256: f2eaf771345b70caea899d265e50fc2840bf2cbc7b263b9b8750bf6fcf75258d
font_01_sfnt_off0000636a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636A 10268 bytes
SHA-256: 1ad46a1eea6a92736f8f73fc9cdbb1708090d3a62474887b9b588217110a5865

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