Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbd89a0a7c6d6b5…

MALICIOUS

PDF

61.8 KB Created: 2020-10-06 18:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 34c03b3952e5a0c961f8a7d8aef026eb SHA-1: 6169d9bb3ef7bf607cc43d5283591b01a162b911 SHA-256: 2bbd89a0a7c6d6b5dc74ec04603e8601dd972efb41936b8f0871d53fee76fe57
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests the primary purpose is to drive traffic to malicious sites, likely for further exploitation or phishing.

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=histrionic+personality+pdf In PDF document text
    • https://site-1040096.mozfiles.com/files/1040096/19573918998.pdfIn PDF document text
    • https://site-1042783.mozfiles.com/files/1042783/67207294548.pdfIn PDF document text
    • https://site-1040134.mozfiles.com/files/1040134/81212884926.pdfIn PDF document text
    • https://site-1041505.mozfiles.com/files/1041505/21131524902.pdfIn PDF document text
    • http://siwab.hole-group.com/uploads/1/3/0/7/130739695/58ef9644.pdfIn PDF document text
    • http://files.highwoodchamber.com/uploads/1/3/2/8/132815346/7b62d815.pdfIn PDF document text
    • http://donuk.nvmedia.org/uploads/1/3/1/6/131636755/6852458.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/1987adbd-84c2-4c60-8ab4-4ec214f0f028/satekukizibiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28420bd2-1cf1-49f8-a082-99c60dc2de44/19257772544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4ccff2-4633-4e84-9587-574d93294bf9/xejefona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/95520902196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9462/5441/files/24304706512.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9010/6775/files/finding_me_michelle_knight_espaol.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_off0000b0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E8 5212 bytes
SHA-256: 05379167991013709411c2c7cb952b3cd4b7aa80603944e62e1ebc89e8d73b73
font_01_sfnt_off0000c2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BB 11668 bytes
SHA-256: 5bf4d17f26dc2710726f2381bbf65300c5e1b09b51a2b32001a77b84e217b9f7

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