Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a4159d3b93137f…

MALICIOUS

PDF

81.7 KB Created: 2020-09-12 21:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7aadb92c852ab1a375c7c83a5376904 SHA-1: f3b18ab2376bcaa25e550574648b17f7b56b0584 SHA-256: 37a4159d3b93137fc2a7a09ba52f3111b5738b0fb3a3b3e7d5bcb7ae7bccf0e7
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One of these links, https://ttraff.ru/pify?keyword=skyrim+se+eyes+of+beauty, is identified as a known malicious redirector. The document also exhibits characteristics of a PDF link farm, with numerous links pointing to external PDF files, likely for SEO manipulation or to distribute further malicious content.

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=skyrim+se+eyes+of+beauty
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/administrao_de_micro_e_pequenas_empresas.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/69013104728.pdf
    • https://cdn.shopify.com/s/files/1/0433/7962/2040/files/subobifegevunevezuzezoz.pdf
    • https://cdn.shopify.com/s/files/1/0463/7677/9931/files/jajuzaderijagigokitefim.pdf
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/circus_theme_music.pdf
    • https://static.usrfiles.com/ugd/493135_d0db8f20fb0a4fd3af61e9cd4a7b0fc7.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_de6f55fe221f401ebc99a6df25513884.pdf
    • https://static.usrfiles.com/ugd/8a419d_895859d6695f4a618d6d60a50626eb54.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_3cc46c0bab2840d8af1bcfaa2b5190d4.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_1c7429ccef1e44fa8bf4b4f229e88314.pdf
    • https://static.usrfiles.com/ugd/b88e3d_5bfa9daef7e54398910143760bb1ca2c.pdf
    • https://static.usrfiles.com/ugd/4c3ae3_394578cd6b8543ad96fc596447421500.pdf
    • https://static.usrfiles.com/ugd/74e905_ff6b08614232423cb35d258396e97e54.pdf
    • https://static.usrfiles.com/ugd/740d8c_cf55389a48bf49e899bb4fbb4bc59b3c.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/76675604971.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/gcse_music_theory_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/4060/2269/files/64593648647.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_off000101ea.bin
6fd852e6234ca2a83fc92d84da9441f7b2ce9aa8d6cbccccaf2026406fce604a
pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 5292 bytes
font_01_sfnt_off000113dd.bin
cda17253dc4cdfc645bd60bde87e261b1b2155422ce3b1779c89f390bd14559f
pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 11736 bytes