Malicious PDF — malware analysis report

Static analysis result for SHA-256 5303640f4ad0566d…

MALICIOUS

PDF

40.0 KB Created: 2020-11-03 10:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 22573053ec0565c1b7f55f6e8fbbda04 SHA-1: 099f5722325f780f5d91808d9d8d1f322dc205f5 SHA-256: 5303640f4ad0566db443d6bce22c4cb51ac637fb3121569e551b7ac2a7c16110
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics, suggesting the document's primary purpose is to drive traffic to malicious infrastructure.

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 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.
  • 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/123?keyword=seaweed+snacks+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f8998bd09a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f90cabe3e692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_5f8c9c995604d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5f95093020bba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f96b86d213d5.pdfIn PDF document text
    • https://xepefebew.weebly.com/uploads/1/3/4/4/134440437/67a2d9ba.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/teruvivelutitezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5f8b75f8ba499.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/765a2190840c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/fts_15_mod_apk_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/wepeliniru/osha_psm_standard_appendix_a.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5451/0492/files/40569671422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a586985-359d-482c-834e-39135df1be9f/60865486376.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/32259963474.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_off00005ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBF 5064 bytes
SHA-256: d10003f715995b859ca1b5e797c39940d38d1ba8d0e2224f1b601d06839e4cd8
font_01_sfnt_off00007029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7029 10192 bytes
SHA-256: d5f64981234612eb0b688a6d96324c92dc4369cf03d193479d33d684b4720053

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