Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd31b524806d9ed0…

MALICIOUS

PDF

51.0 KB Created: 2020-10-05 02:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0468ab97168fa8f4116d482d46209b2c SHA-1: fed39753c9daefd4df5cb7435eafb8af2e80d026 SHA-256: cd31b524806d9ed0016a7bac8c48baa01b22aaa0e08df27fc72c1914b9f6995d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file acts as a link farm, directing users to numerous external websites, one of which is identified as a malicious redirector. The document's primary function appears to be to drive traffic to potentially harmful sites, leveraging multiple hosting platforms and disguised links. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious redirector link.

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://gettraff.ru/strik?keyword=mariage+d%2527amour+richard+clayderman+pdf In PDF document text
    • https://site-1039804.mozfiles.com/files/1039804/72502269469.pdfIn PDF document text
    • https://site-1037033.mozfiles.com/files/1037033/75364653330.pdfIn PDF document text
    • http://gunokit.marcaaronsenoner.com/uploads/1/3/0/9/130969744/9623020.pdfIn PDF document text
    • http://moxazuta.thessalageman.com/uploads/1/3/2/6/132680977/6036502.pdfIn PDF document text
    • http://zisik.soque.net/uploads/1/3/0/7/130775491/f09927e3c5a.pdfIn PDF document text
    • http://files.rsgallardolaw.com/uploads/1/3/1/1/131164552/d5282ea.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/e725aee2-9a9e-4ff0-9d8a-db068c8de423/40116586825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032887df-3558-44c6-969b-d3c9f3627403/98777647214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a859d3e-1ed0-4cd3-8e1b-dd74fc56bcd1/pemibobip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff57f5d-2588-4441-aaed-aabf1a2cf6fc/69322375951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4337/2703/files/dressmaker_sewing_machine_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000625f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625F 4120 bytes
SHA-256: d3d607dbed5927d11dfe24950a8a6531054131d8b544f3f50dcc0816a6e6ba26
font_01_sfnt_off000070f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70F0 5532 bytes
SHA-256: 00f229cc15bfda4e6dd3926597e91db8c914e583ae70f21e8880494a83d50755
font_02_sfnt_off000083ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BA 11108 bytes
SHA-256: 70d7ddba4a2ac4e5bf6d6dafd977e1a80416a58af1b409ec1df134221a0030e3
font_03_sfnt_off0000a964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA964 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12

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