Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6479c1dd8a29c73…

MALICIOUS

PDF

41.1 KB Created: 2020-09-30 07:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 30e1689566fd9d9385e545efc63951db SHA-1: e08c26736d3e54b8b73993e18ce400ad58dbd818 SHA-256: b6479c1dd8a29c7373c44b79b07e10e65a7275fb025b5b1af01a77b0a049d8e5
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure and a large link farm. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of these links suggests an attempt to redirect users to malicious sites or to manipulate search engine results.

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/strik?keyword=addition+and+condensation+polymerization+pdf In PDF document text
    • http://files.setgogym.co.uk/uploads/1/3/1/8/131856772/zulivasavupapo.pdfIn PDF document text
    • http://wuwujese.jacktoad.com/uploads/1/3/2/6/132681268/popijub.pdfIn PDF document text
    • http://files.garudashantiyogadance.com/uploads/1/3/2/7/132740756/fidez_fujowidi_tusaseb_jetoruj.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/1/0434/5017/1554/files/21960954335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97e1dea-755a-4406-a97f-e89f09833e16/muxozupubojumogawajutud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2cb03ba-3e8d-4391-915a-3b4c9671598b/13813248883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e579b98-fb91-4f92-94cd-091208d9fa8b/60645715900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a2fa26-b807-4579-9232-debd7c8c3e93/bokiraxalexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b368e1a-e166-4ae0-bc79-5a3f75aa9e93/vapekivujozosupofinimagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad1404fb-b377-4f76-82eb-37e4c2dc5391/52505345775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d760d8-ab5c-4f7b-9d1b-b594ebd77cee/91465648315.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_off00006336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6336 5440 bytes
SHA-256: ecea1de4f2a5ede8ce9c518e7022e377fd5ebf6dd37483b6077bc074f15bdf81
font_01_sfnt_off000075b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75B7 9940 bytes
SHA-256: 86b008d288fa5051d7a737e2c8a8a3157416667c35c38e756bef2e43f9621870

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