Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd318fa499f6779…

MALICIOUS

PDF

63.3 KB Created: 2020-11-04 09:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 274cc71cbc80f33d86f5c5fbcaf41dfa SHA-1: 1dc9825ac75eae4d22075fc9f8408cc5eb4c1611 SHA-256: 4cd318fa499f677915e8c742862b642824a20e440dc5dae6a2c972bd8920a05c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. One of the URLs, 'https://ggtraff.ru/strik?keyword=orange+county+buddhist+church+logo', is identified as known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?keyword=orange+county+buddhist+church+logo In PDF document text
    • https://beperiguvo.weebly.com/uploads/1/3/4/3/134320750/551704.pdfIn PDF document text
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/8f5d5c07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5f9757c058281.pdfIn PDF document text
    • https://morizuni.weebly.com/uploads/1/3/4/6/134606759/8628c9a6a.pdfIn PDF document text
    • https://vamepuruzaf.weebly.com/uploads/1/3/4/3/134352512/1179857.pdfIn PDF document text
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/zonujagofunalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5fa1419881d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_5f8e981eb64bd.pdfIn PDF document text
    • https://lezunodukulo.weebly.com/uploads/1/3/4/3/134341823/nikekabusewekev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fa20303a69dd.pdfIn PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/504cc2a900daf.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/427df067-4a5f-4cef-91c0-0e1640dfd305/manual_de_vacunas_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d909b7af-15cb-4642-9583-cc097c2103de/19626688403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377ce752-3e01-4b5a-9b44-fe490739e170/95640746329.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BB 24476 bytes
SHA-256: 9dc1766dfbcf0ccdf7d6bdd6ccbe48b62c977a7adad58ae07c7b80e9617bf84f
font_01_sfnt_off0000b6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B4 5472 bytes
SHA-256: 0788c90c3ad8d68bc1d39fae3601d58069910031e873bb6fefaaf747817cc289
font_02_sfnt_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 11312 bytes
SHA-256: 9270885eee8dfce5a1172c5ab1c6e32b99ef6b8034e8dd03bac76c48cf8d809b

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