Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabaca9da745c4ae…

MALICIOUS

PDF

43.4 KB Created: 2020-08-17 00:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdacbc2cfdae40a094ac279998f7f157 SHA-1: 39b3b57c7a1bb749368780ba57732da6c6525f01 SHA-256: fabaca9da745c4aec69e2404d3255bff98eb3b03018c915c9da9c9a40ddf235b
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though partially corrupted, contains text related to 'American history quiz answers' and includes the malicious URL, suggesting a lure to trick users into clicking through. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to potentially compromised Shopify domains further supports a content-farming or malware distribution scheme.

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.ru/pify?keyword=american+history+quiz+answers
    • http://files.jamesholbeck.com/uploads/1/3/0/7/130775231/tipawidejo.pdf
    • http://files.cuib.eu/uploads/1/3/1/6/131636737/3571c2ed260.pdf
    • http://kuraz.opticalequipmentcenter.com/uploads/1/3/1/3/131383790/76c14b56.pdf
    • http://zomibofux.gracechurchoftemeculavalley.com/uploads/1/3/1/4/131452883/fomam.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/xulaguzivadejutabaxizukes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/81198041261.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/93484479850.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7417/files/sugotolabixos.pdf
    • https://cdn.shopify.com/s/files/1/0435/6374/5441/files/candidiasis_en_hombres.pdf
    • https://cdn.shopify.com/s/files/1/0432/6414/7609/files/mogajarakadodu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7404/3552/files/65002736809.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/30300844102.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2919/files/25093347490.pdf
    • https://cdn.shopify.com/s/files/1/0432/2607/1199/files/ielts_score_reporting_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0436/5703/5929/files/deep_pocket_fitted_sheets_measurements.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_off00006b86.bin
6fbc9e07c29903ba94c7ff0dceb1110ed5c8c0c64a18a110edc6f829807861ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B86 5368 bytes
font_01_sfnt_off00007dac.bin
f4dea940599134208494bdc8a404845987d9584638e2c994fdb4c330fa9f1c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAC 10448 bytes

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