Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45e9623c5e7bf3d…

MALICIOUS

PDF

34.5 KB Created: 2020-08-20 21:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dcf6854d050d615eac5535633c95c6e SHA-1: 781a4a5b054fc8472b9176dd3f48299029cfc502 SHA-256: f45e9623c5e7bf3d3270d3994c4ed8fecce48f8011ccf939f7e532a3f1b6b77a
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=bios+utility+asus'. This URL is embedded within the document body, disguised as a BIOS utility. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to malicious infrastructure.

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=bios+utility+asus
    • http://kimapaxup.bbt-livonia.com/uploads/1/3/2/3/132303354/18d0dca34.pdf
    • http://wanedizo.aetherealsea.com/uploads/1/3/0/7/130775203/9a1da3b9c252.pdf
    • http://files.maslowspeak.com/uploads/1/3/1/4/131453934/3554054.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/medenerota.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/8492198120.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/54369926385.pdf
    • https://cdn.shopify.com/s/files/1/0431/1662/6081/files/convertir_de_a_word_gratis_nitro.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/58863410725.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/discord_markdown_text_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/niwitidebifikul.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9896/files/98136912300.pdf
    • https://cdn.shopify.com/s/files/1/0440/1908/9566/files/ibm_cognos_tm1_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/34163688750.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/tonisazirofof.pdf
    • https://cdn.shopify.com/s/files/1/0433/4528/1183/files/16064205882.pdf
    • https://cdn.shopify.com/s/files/1/0447/1295/1961/files/gta_5_pc_cheat_codes.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_off00004cba.bin
bdd4c0e5991ed3d59393b8ed90c9fe17ecbcfa75ad4ba6bef51a67d2e117ddba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CBA 4736 bytes
font_01_sfnt_off00005cea.bin
ed0ce4a6b958a4e64e8bc18993a993b5ab65c3859f9df72fa87bfdcfb84fd670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEA 9628 bytes

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