Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d384f2133f1b6d…

MALICIOUS

PDF

40.5 KB Created: 2020-09-30 01:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d2a88166414cffbd48d55a0536064919 SHA-1: ac5c4fe5bb5a9301bbfd37d693fa096c59a7386b SHA-256: f1d384f2133f1b6d4a02a4aa379aad7f7d945f852e24af516826eee9c0770059
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is flagged as malicious due to its extensive use of external links, many of which point to disposable hosting and redirector infrastructure. The primary URL, https://cctraff.ru/strik?keyword=svb%252F+bls+2015+pdf, is identified as a malicious redirector. The document's structure suggests it is part of a link farm, likely for SEO manipulation or to distribute further malicious content.

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=svb%252F+bls+2015+pdf In PDF document text
    • https://site-1037920.mozfiles.com/files/1037920/99435662946.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/29503772944.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/dezisenabapovubegopuz.pdfIn PDF document text
    • https://site-1036629.mozfiles.com/files/1036629/ratatowuxus.pdfIn PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/78774609471.pdfIn PDF document text
    • http://suwazubaw.stephenjonesjewellers.com/uploads/1/3/1/3/131380828/vuterokirifa_fogutaxoroka.pdfIn PDF document text
    • http://biwinuw.msdorrwilbur.com/uploads/1/3/0/9/130969723/2b11200.pdfIn PDF document text
    • http://weralep.fsanase.org/uploads/1/3/1/3/131383510/dawalefurakijusi.pdfIn PDF document text
    • http://desem.yofini.com/uploads/1/3/1/3/131378779/voroxaxubarefome.pdfIn PDF document text
    • http://files.explorestanton.com/uploads/1/3/1/4/131453216/6741733.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/b117492e-56cd-4023-9d95-92d6fe414cc0/81173187544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7588b2df-2fa5-472a-a25b-e31699830da7/mufaloretakisel.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_off000060ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BA 5520 bytes
SHA-256: 0d8267d5bb943b00a600a724ee90551be85f499ca5b06236c4a44e2d8efc8c22
font_01_sfnt_off000073b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B0 10080 bytes
SHA-256: 2fc4b409372841b20eeb4ad66ac386436c8a9ba9160da346b8cca776597fee45

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