Malicious PDF — malware analysis report

Static analysis result for SHA-256 40329a0048135bcc…

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 12:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4409398eb059920b302b4c933c1f27b4 SHA-1: aac519ed7b9f64cb66ea34a43f31c67e0858cae3 SHA-256: 40329a0048135bcc2ff2d873ab1e258cfdaf4af9a7053caeaeb76b440b5469e7
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a technique often used to create link farms. One of these links, 'https://ttraff.ru/wix?keyword=gould%2527s+pathophysiology+for+the+health+professions%252A%252A+%25286th+ed.%2529', is flagged as a known malicious redirector. The presence of numerous links hosted on 'static.usrfiles.com' and 'cdn.shopify.com' further supports the link farm hypothesis, suggesting an attempt to lure users to malicious sites.

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/wix?keyword=gould%2527s+pathophysiology+for+the+health+professions%252A%252A+%25286th+ed.%2529
    • https://static.usrfiles.com/ugd/b8c837_5abee67d93264a0a8fa8ec8f88a3df11.pdf
    • https://static.usrfiles.com/ugd/47b1e8_201c8af0fc6b4b188105a785cb32500a.pdf
    • https://static.usrfiles.com/ugd/e33828_e087fc990f6b4b76b5c18171419e4bb5.pdf
    • https://static.usrfiles.com/ugd/469aea_35a682ec22ad45ff83cf8f006fdba5fd.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/53952933021.pdf
    • https://cdn.shopify.com/s/files/1/0431/1882/1530/files/ielts_band_score_7.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/biblia_para_nios_ilustrada.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3362/files/2573952069.pdf
    • https://static.usrfiles.com/ugd/89c6ad_581ff98bad4c47e89935a5e3577104e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c00142f31b04f188c99cb799bd37d61.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_off000058f7.bin
ecf002e47acd693f57ba8aae861138fd27b1b68209fca389143137a3a9f83093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F7 5880 bytes
font_01_sfnt_off00006d2d.bin
3419047f2b54c21ca9fc8b70a3e223a0452ca2487bd6c5ba20f747f6d15f81e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2D 10576 bytes

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