Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f36c4fb3b3345…

MALICIOUS

PDF

38.1 KB Created: 2020-09-17 07:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09af92bf114c9880a1887f815f116385 SHA-1: f30d030c7aae0f750e9a97b447c05bb2487c23a3 SHA-256: bf8f36c4fb3b3345f560087adce00a265fe77eef8c44ae56925eba8dab2e7e4a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, forming a link farm. One prominent URL, 'https://ttraff.club/wix?keyword=mason+dixon+basketball+disasters', is identified as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious redirection 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 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://ttraff.club/wix?keyword=mason+dixon+basketball+disasters
    • http://files.chicagomovietours.com/uploads/1/3/1/8/131871902/xesowonekari_pedozurik_nexikivulosiku.pdf
    • http://files.geppscrosscricketclub.net/uploads/1/3/0/8/130813320/4034730.pdf
    • https://cdn.shopify.com/s/files/1/0434/6619/5106/files/pevafusowukarejiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/2886/5446/files/sodudalasuvunefize.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/52124624252.pdf
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/87030760688.pdf
    • https://3560a9d0-ed33-4680-8038-0be14d5e896b.filesusr.com/ugd/bb4607_a625c9d64bfd4877bfa23c33f151492b.pdf?index=true
    • https://e082b6fc-5c24-4bc2-9003-a0d2a68b9ba3.filesusr.com/ugd/d61b30_4f475e8f8eef42ab9c374764142bd124.pdf?index=true
    • https://54c53c8e-d942-469f-be50-7decf8f5cf59.filesusr.com/ugd/565485_969c46cae1974e9f82c053d2b49a6e78.pdf?index=true
    • https://6bee3f0a-ce92-4969-9181-8832f39c372c.filesusr.com/ugd/285be4_953be30905094f5bb04cce1b9a4736ab.pdf?index=true
    • https://a33cb1bd-f0ec-44a1-a881-8d757a621bf9.filesusr.com/ugd/f5a024_7c88973a95ee4e80a9d77154a50a38fe.pdf?index=true
    • https://6dd6f175-fa88-416a-80b1-77a6234e192c.filesusr.com/ugd/a98ecc_763e0933166f462699edb237198dc8ae.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000598e.bin
4186d599a7eced04078d40d441499adc59a2fd298ea0b4976b47dbc7a7e407b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x598E 5096 bytes
font_01_sfnt_off00006afc.bin
6c7bd2b7fb56c08b33d102b9df8d3c91100c02064d419ddae9c4b37f749dc158
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFC 9720 bytes