Malicious PDF — malware analysis report

Static analysis result for SHA-256 91aa30567969ce3e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-14 23:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d58f4a3f48fd33ffcea86b34d728e9 SHA-1: 0fb5342bbd074864e532e97a0e5d052d1323d0b3 SHA-256: 91aa30567969ce3e12f1e4b3440823ebd49ae0cd660caadac332fccecb0377a6
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to known malicious infrastructure at ttraff.ru. This suggests a link farm or redirection tactic to obscure the ultimate malicious destination. The ML classifier strongly supports the malicious verdict.

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=bundle+android+l%25C3%25A0+g%25C3%25AC
    • http://files.bojanradovic.com/uploads/1/3/1/3/131397987/77cfd734.pdf
    • http://files.chipperchadbourne.com/uploads/1/3/0/8/130813317/tewabus-gikiwasigadozu.pdf
    • http://nizobazel.en.inmatesvoices.com/uploads/1/3/1/4/131483334/zixago.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5073/files/65677630263.pdf
    • https://cdn.shopify.com/s/files/1/0439/3828/3678/files/newexa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/bajenegepivaxitetowisudo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/color_by_number_addition_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/2423/7212/files/31436709130.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/5895387117.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/tart_altered_states_of_consciousness.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/algebra_structure_and_method_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0439/1819/6891/files/application_lifecycle_management.pdf
    • https://cdn.shopify.com/s/files/1/0435/9615/2995/files/5193717913.pdf
    • https://cdn.shopify.com/s/files/1/0437/0055/1830/files/east_west_bowl.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_off00006547.bin
34800fb1ce7a172619fae01b1c3e14e10de00d461fccc6e2e33c4fd481da9062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6547 5152 bytes
font_01_sfnt_off00007645.bin
4a0ebfc8b15e1750ab2167c0799a605c5a7f2745288fd31dc0f45bf6d3438a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7645 10944 bytes

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