Malicious PDF — malware analysis report

Static analysis result for SHA-256 f892826669994ad7…

MALICIOUS

PDF

48.0 KB Created: 2020-07-31 05:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 203bbf24e39caab4e5b7cbf50aabd6ce SHA-1: 145cd818d03a93bf67f6c2620194be1eea0b8c50 SHA-256: f892826669994ad70710da098febf4d6dba5b314f52117018a982f5297028a90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but also includes a critical link to 'ttraff.ru', identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Types of stroke and treatment pdf', suggesting a lure to attract users searching for medical information.

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.ru/pify?keyword=types+of+stroke+and+treatment+pdf
    • http://files.stmaryswestcolumbia.com/uploads/1/3/2/8/132814050/9b1f649a3f32090.pdf
    • http://files.ionian-aquarium.com/uploads/1/3/0/7/130738894/suwejo.pdf
    • http://files.texasdispro.com/uploads/1/3/2/6/132681863/vukizi.pdf
    • http://files.greatcondoforsale.com/uploads/1/3/1/4/131410818/lozunidudi.pdf
    • http://files.ibrahimsaidceramic.com/uploads/1/3/0/7/130775634/2249903.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/mexewefemalas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/2132455715.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/wunaxurexizemet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/zelagegelixan.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/62992406970.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/10001025343.pdf
    • https://cdn.shopify.com/s/files/1/0434/0200/2584/files/79906111433.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/9280008800.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/84896418759.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/78510312256.pdf
    • https://cdn.shopify.com/s/files/1/0432/8095/7593/files/xitexode.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/42858408979.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f63.bin
f2bb655e6d6d6861257040dccc4838deeb6ba92b16f6fb546e57dd2224161a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F63 5012 bytes
font_01_sfnt_off00009057.bin
921438860407818e07fd6e9399e01b6a8b293de47bde6cfe9e1d1a3a873fd06e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9057 9984 bytes

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