Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e64d8695c8ed38…

MALICIOUS

PDF

85.8 KB Created: 2020-10-03 13:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3fc467c6b0f92ce9d5c415995198ed80 SHA-1: 948456cefa5bf8d5c176ba746bc21a3e177b4c38 SHA-256: 28e64d8695c8ed38ae9742881f36a1a8fd86f916063b5f173e70c3118a8613a4
154 Risk Score

Malware Insights

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

The PDF contains embedded links and document body text that directs users to a malicious URL, masquerading as a game guide. This indicates a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a redirector link and part of a link farm.

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 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.
  • 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=osrs+drake+melee+guide In PDF document text
    • http://dojuwume.vmnshenandoah.org/uploads/1/3/1/3/131398440/tirazofedes.pdfIn PDF document text
    • http://files.cherisher.org/uploads/1/3/1/4/131454816/zitukuluz-nizafavigifox-pumonukagiv.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/d0d1762f-f7e7-431b-a8a6-7610a069ed87/5335586277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d636b8f-e6e8-4cae-9bc0-55c3207e4366/33519674638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce365eaf-6758-4b2c-b750-23be530eebc5/49599945894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a7d525-efb1-4cbc-9dd5-59b05ac3b2ff/66040334408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59d940f-fa6c-4325-a1a5-9aa0bc23fc66/wajasegorawodabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6680ac26-70d9-458f-a182-3df868d0ce5a/gazavubegovigogekisoju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0733/4810/files/2932661539.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/web_services_basics_ppt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7766/4413/files/illinois_air_team_schaumburg.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_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 5236 bytes
SHA-256: 250cb9e7b2aaf4c7c35a51f5f4ee7a0c37f7157c98d4abaac3b56f35ad5bf5d0
font_01_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 11180 bytes
SHA-256: 87c393893dada3aeb8d274f7a799b39d9b1bc119adbf4ea73760d7c13dee624a

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