Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dc91b6630db81b…

MALICIOUS

PDF

53.3 KB Created: 2020-10-11 15:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e957f4a74c236a8428b38f82838469c6 SHA-1: f152e34e5dc2f3a8158d6443e9504297348b7f74 SHA-256: b4dc91b6630db81b6722212c2b85aba0871c6271ae80212ea28a5620e9f23c6b
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?keyword=bmw+m50+engine+diagram'. The document body, though heavily obfuscated, appears to contain text related to the lure. The ML classifier strongly indicates maliciousness, and the presence of numerous links on disposable hosting further supports a malicious intent to redirect users to harmful content.

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=bmw+m50+engine+diagram In PDF document text
    • https://site-1038455.mozfiles.com/files/1038455/67685149748.pdfIn PDF document text
    • https://site-1043855.mozfiles.com/files/1043855/82430070215.pdfIn PDF document text
    • https://site-1037227.mozfiles.com/files/1037227/kewomus.pdfIn PDF document text
    • https://site-1036629.mozfiles.com/files/1036629/75695619604.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/gafesujajere.pdfIn PDF document text
    • https://site-1039707.mozfiles.com/files/1039707/97426863797.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/semoxigesozimusofobigafa.pdfIn PDF document text
    • https://site-1037069.mozfiles.com/files/1037069/zunup.pdfIn PDF document text
    • https://site-1040082.mozfiles.com/files/1040082/lexojolel.pdfIn PDF document text
    • https://site-1037157.mozfiles.com/files/1037157/30839254677.pdfIn PDF document text
    • http://surol.emmyandjesse.com/uploads/1/3/0/9/130969757/jiwew.pdfIn PDF document text
    • http://files.martinstravel.com/uploads/1/3/0/7/130739444/4b7985b4ce.pdfIn PDF document text
    • http://moximogej.kidsoutdoorliving.com.au/uploads/1/3/2/6/132681556/tiwijejorado.pdfIn PDF document text
    • http://files.balaccounting.co.nz/uploads/1/3/0/7/130739175/fuvujaregir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/383da350-64b0-436d-b34b-888af8da740a/jefovibaliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cee262f-bd82-43e4-9c18-1a8afc360187/26688252511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffa2e7e-10af-473a-a435-c1f67aa8f1ed/4751181809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52172b67-51ef-42fe-b7ac-fd7f1ca5df49/jiwijiripabub.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_off0000849b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x849B 4940 bytes
SHA-256: 5d7b873ac27c1ce4567e447f1da5d37f47ab4cd9069db159b4edd0e5c4f27fb2
font_01_sfnt_off00009548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9548 10756 bytes
SHA-256: 2ab6bf7173836468d7ae181e3c9848a5570f41a75e0b03b96bb7f870328f7d88
font_02_sfnt_off0000b9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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