Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a6a9d1c58e66a7…

MALICIOUS

PDF

34.4 KB Created: 2020-10-09 01:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b06509dca3079d338d2f5538c0383cf6 SHA-1: d96218fb60602d1838a15c864a2104523bb973f7 SHA-256: b2a6a9d1c58e66a73845cf8c7b205ae29adffd06156c8d1d3af728e7ed97f4b7
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though obfuscated, contains URLs that are also present in the extracted URL list, suggesting a coordinated effort to direct users to potentially harmful sites. No scripts were extracted, but the presence of malicious links points to a phishing or malware distribution attempt.

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=waterdeep+dragon+heist+maps+and+misc In PDF document text
    • http://sakoj.hkawgbc.com/uploads/1/3/0/9/130968915/pokimebawizibiv_godesumomijufup_lobexevije.pdfIn PDF document text
    • http://files.baconandbears.com/uploads/1/3/0/9/130969435/dijut.pdfIn PDF document text
    • http://files.bayareahomeschoolfair.com/uploads/1/3/1/4/131407110/miresusidunojevosola.pdfIn PDF document text
    • http://files.tradbowmt.org/uploads/1/3/1/4/131437198/4844462.pdfIn PDF document text
    • https://site-1037839.mozfiles.com/files/1037839/52096427475.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/22518264376.pdfIn PDF document text
    • https://site-1038827.mozfiles.com/files/1038827/87903058625.pdfIn PDF document text
    • https://site-1039602.mozfiles.com/files/1039602/jubutoxikubirafokosan.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/e1be31ce-95db-422f-8de3-5090063e22d4/defibezoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d837d310-7cf6-41f7-bc23-5828e210290e/dudepofekalike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/330adb3c-a9c8-46a9-8b1d-5dd96d93a84d/54716243268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af00f03-b528-4492-b1a0-773a00a142b7/rosogibidaken.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1886/0190/files/zijakiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0901/4940/files/2507480432.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0118/5957/files/cap_manual_39_1.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_off000048c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48C7 5468 bytes
SHA-256: 6379e87e066b08115500cba5be5b23aa0314e1c88a9241f8dbc931b102be3d23
font_01_sfnt_off00005b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B44 9812 bytes
SHA-256: af757b7e1e47ad92de33b435cbd169f3780a19cb887b6024d1ee84e851289d25

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