Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6d543df5838ebb…

MALICIOUS

PDF

45.4 KB Created: 2020-08-18 23:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeec33ff1e9856587a4199d0b62f5a54 SHA-1: a88dc00720dd43ad8d734c72c9023c3cd3620e12 SHA-256: bd6d543df5838ebbdfe8d573de59ad15d82430c30031095c8d5b91b11f3d7d95
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'obstructive sleep apnea patient education pdf' and a URL that appears to be part of a link farm designed to manipulate search engine results. The primary malicious IOC is the redirector URL.

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=obstructive+sleep+apnea+patient+education+pdf
    • http://pulid.elizabethmphillips.com/uploads/1/3/0/7/130775573/4e4476b.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/40463886128.pdf
    • https://cdn.shopify.com/s/files/1/0430/2058/3065/files/spanish_2_capitulo_4a_crossword_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/gopakidumazojikovave.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/wajisabedovutunod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/kekelirup.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/dewegakazesuda.pdf
    • https://cdn.shopify.com/s/files/1/0434/7474/7558/files/vim_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/57249504419.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7676/files/kanimudilakezamalokexo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/taylor_swift_rhapsody_originals_songs.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/supply_chain_management_vtu_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/80439740088.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_off0000724e.bin
3b175cabbc93b649d522c9ce6608c80ecb7702156e8257471a0f3fffe1454b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724E 5376 bytes
font_01_sfnt_off000084a0.bin
b65e5294b125852c8af76870ef18a77340a2e3c197293f79c90bca752fab63e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A0 10668 bytes

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