Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e51d35bc2faa468…

MALICIOUS

PDF

80.9 KB Created: 2020-10-01 00:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0edfe567cd9dc10c1a99dccb57c50806 SHA-1: e23b38ac6f5eb8d8843a56543ca41c836cadef58 SHA-256: 0e51d35bc2faa46812ac970650a125999390075c6190416dc18778aaa583468a
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable hosting domains and redirectors known for malicious activity. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic, likely for phishing or malware distribution.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=equinox+brooklyn+heights+classes+pdf In PDF document text
    • http://files.franhutton.com/uploads/1/3/0/8/130814209/1ca5f4.pdfIn PDF document text
    • http://fowuruj.chamonixpatinage.com/uploads/1/3/2/6/132695832/9503928.pdfIn PDF document text
    • http://saxadaf.mylifeinlanguedoc.com/uploads/1/3/0/7/130776460/9058025.pdfIn PDF document text
    • http://xawin.blandinepluchet.com/uploads/1/3/1/0/131070272/16f32506d0f3025.pdfIn PDF document text
    • http://sujudo.findingthewriterwithin.com/uploads/1/3/0/7/130739978/1094c99bef.pdfIn PDF document text
    • http://files.empocus.ca/uploads/1/3/1/6/131607164/gemelufutinuxafuba.pdfIn PDF document text
    • http://files.digitalfxtbook.com/uploads/1/3/0/7/130775475/nidigokuxomibud_mapajibomotew_xovodunosasi.pdfIn PDF document text
    • http://files.search.glenridgetkd.com/uploads/1/3/1/8/131856121/075bb8b4f6db268.pdfIn PDF document text
    • http://files.sherilabrant.com/uploads/1/3/1/4/131452801/4626903.pdfIn PDF document text
    • http://files.globalmusicp.com/uploads/1/3/1/4/131408864/febejojelokekixaba.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/1155a549-39ee-44f8-917b-058e381b9c1b/melib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2907aa-8c60-434c-b6ac-84c53b712b76/34750554156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bea0ce0-6973-4638-b263-a780f8ef53ff/23122571468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f6bace-cb61-4ebe-a878-7fc33ec33f3b/wuxusesuked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53dfef3a-87b7-453d-bfe1-88a5ce274d80/72607683569.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_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 5872 bytes
SHA-256: 0f69009bba7fadd11aa9f843d51d06541dd9f21807a59b522419707039fb4278
font_01_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 13780 bytes
SHA-256: 324dff5000088a093adc924eb46d7624dedf2b840cb4d0d1a0269ecd64e5a43a

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