Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6dba0e8b99841e…

MALICIOUS

PDF

35.9 KB Created: 2020-08-16 01:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a537003f3795b810484c42237be45c7d SHA-1: f16cd230927e972acec7818cb4c33419ce94cfe0 SHA-256: 9b6dba0e8b99841e9306301c39a05cfbbf21be50182baf3090d38860dd22da6e
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a 'Dave Ramsey budget worksheet'. This redirector likely leads to a malicious payload. The PDF also contains a large number of embedded links to other PDFs, many hosted on Shopify, which is characteristic of SEO link farm abuse to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=dave+ramsey+budget+worksheet
    • http://mujarebe.soulfoodstudios.org/uploads/1/3/0/9/130969077/2795806.pdf
    • http://torija.villaspain4rent.com/uploads/1/3/2/6/132696414/5454523.pdf
    • http://xireb.bathfix.co.uk/uploads/1/3/0/8/130874478/28816749a7.pdf
    • http://files.robertbolger.com/uploads/1/3/1/6/131607163/1829887.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/lojagovaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/21504303113.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9607/files/core_muscle_exercises_for_lower_back_pain.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/adverbial_clauses_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/32813135668.pdf
    • https://cdn.shopify.com/s/files/1/0435/3441/8075/files/pizepibumusizuwesisosinug.pdf
    • https://cdn.shopify.com/s/files/1/0429/2159/0951/files/4782217131.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/53843952670.pdf
    • 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_off00004d4b.bin
ccbd0ec60f8e383a02f7fd16d3e5f4804b2a0f8710cef8d44a8ae5b40ea1f953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4B 5664 bytes
font_01_sfnt_off0000608f.bin
012edb648a07eca9ddf0b9a6b1d776a2c29cbb9e10db979acd4d70fd132563aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608F 10208 bytes

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