Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b78a897011b8255…

MALICIOUS

PDF

56.3 KB Created: 2020-10-26 15:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fe3545bfe80c622197f6e4e42902568c SHA-1: 945daa90e7c21cfe92bd783d0b6093b0587c5aa9 SHA-256: 1b78a897011b8255c838df456b92ebd71c0c7c92a97b7de9e21af079ae395a0d
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector. One of the primary URLs, 'https://cctraff.ru/aws?keyword=function+of+bile+juice+pdf', is flagged as malicious. The document body, though heavily obfuscated, contains this same URL, suggesting it's the intended destination. The presence of a link farm on disposable hosting further supports the malicious intent, likely to lure users to malicious sites.

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/aws?keyword=function+of+bile+juice+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5f968115cb820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_5f8d57f6b75f6.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/73e8062f9.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/zunovume-varurej.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/nenuw.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/nedujebojezifum_bivexan_miviwi.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/bapipajiz.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/ff06dfdf.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/dozup-tejejuwovil.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/9cc4780c-053a-45dd-937e-af87cbfbe0ed/64310607080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f6e1a4-9e0c-4f6d-9ff4-f0d409195c27/18187144833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37711340-3705-4f7a-a128-9db4ac1ef34e/jibafove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf51e8a3-b6ab-4c55-90c6-6dca0c84857b/41375218302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d04b4f1-af24-4c06-a2be-07271f5f767b/dozagogeveka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259f1465-f80a-4e06-8950-ed2cdcc40aca/kazibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdfdc88-d7b3-4016-a9fa-58fbb6e9fa26/62070470538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e7b39e3-64c3-4a5e-8999-7234f5e09b13/27288802577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b71e27-abf6-4441-a139-6ebacacda94f/8961308913.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_off000091db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DB 2972 bytes
SHA-256: 58d57dbf1cce936347ca7471b2ff1814838416484fbea0fdd6c82954352fee64
font_01_sfnt_off00009c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C83 4836 bytes
SHA-256: 837aa03a39a977bf2c21a5e5713ae5734b31f270bc5e9bf32253b3aaf483db27
font_02_sfnt_off0000ad05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD05 11364 bytes
SHA-256: 26fd78f4fb2665f219d1e04af839e0113bb410841ce7293d252573202f6f967c