Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c0ac37a4ea2396…

MALICIOUS

PDF

60.3 KB Created: 2020-08-06 18:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b15af8d07ca92de95f4540e226c0f562 SHA-1: ceb9f09f67af4bf36b69fa58030695f880cf001f SHA-256: 76c0ac37a4ea239627e533717f5b21e0956a548fd8dc2b9746760a784c065f6d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though partially garbled, contains text related to a scientific examination and the tool 'wkhtmltopdf', suggesting a lure. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm used to obscure the true malicious destination. No scripts were extracted, but the primary malicious activity is the redirection via the embedded URL.

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.cc/pify?keyword=examen+cytobact%25C3%25A9riologique+du+liquide+c%25C3%25A9phalo+rachidien+pdf
    • http://files.coolcaribbeanvacations.com/uploads/1/3/1/4/131406108/sirufetolen-tabov-supej-fupezoma.pdf
    • http://files.snowypeaksoap.com/uploads/1/3/2/3/132302973/a7512c13cdce8e.pdf
    • http://files.pekinbible.org/uploads/1/3/0/7/130776142/momivokogumonut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/pisuko.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/93234490286.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/82683383439.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4884/files/bofosujadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/24736154387.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/mojuxepodonob.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/tiwiwekorowol.pdf
    • https://cdn.shopify.com/s/files/1/0438/7497/5912/files/tubifatiweluxizepazo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/56361638589.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6791/files/zanusejud.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/dodej.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/28260088429.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9830/files/89320348457.pdf
    • https://cdn.shopify.com/s/files/1/0437/3214/0186/files/understanding_business_9th_edition_download.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a512.bin
593381f2dbf97a2d834218bac365b41162f1fcc36f87aa3c8142273d4bca038e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA512 5924 bytes
font_01_sfnt_off0000b8cf.bin
58606963ebf021a115f29f26d4010d50d88b10cceec7b304d5289bcda56e8404		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CF 12876 bytes

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