Malicious PDF — malware analysis report

Static analysis result for SHA-256 424c2a64ee0b80bc…

MALICIOUS

PDF

37.6 KB Created: 2020-08-30 23:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a18cf895601959d1205bcef50df14047 SHA-1: cce9509523ef895f37b193fdc1469810f9fbdc73 SHA-256: 424c2a64ee0b80bc1de2ac60e529daf86de1f0ec7968358203bebd3848aebc75
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used to obscure malicious destinations. One of these links, 'https://ttraff.cc/wix?keyword=mendeleev+lab+of+1869+answers', was identified as a known malicious redirector. The presence of numerous links, including the malicious one, strongly suggests an attempt to lure the user to a harmful website.

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.cc/wix?keyword=mendeleev+lab+of+1869+answers
    • https://static.usrfiles.com/ugd/b8c837_642773ac15ce4b6585d5d3bfa5f34a20.pdf
    • https://static.usrfiles.com/ugd/b8c837_49f50439a2954bceb8847135f482ab26.pdf
    • https://static.usrfiles.com/ugd/b8c837_399118f2549c40978629cf89fc0d8baf.pdf
    • https://static.usrfiles.com/ugd/f55bec_296fed8f78104d2ca6d9a77c64bae200.pdf
    • https://static.usrfiles.com/ugd/01e791_ba73cded69de42b3a7c4e206b1992123.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/codex_gigas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/55478085482.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3045/files/linux_for_programmers_and_users.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/19410185734.pdf
    • https://static.usrfiles.com/ugd/fd3290_2ea2e72271a84cbbbaef08525aed8857.pdf
    • https://static.usrfiles.com/ugd/739437_b0e57d927c3d45f68ff23e0286a447db.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ebabf572332487ba4a4f7712ca3cfcc.pdf
    • https://static.usrfiles.com/ugd/a18aa6_4484799fe6874e9491318886829ac5f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_aac472d0d2e94c5cb07ef860891dd7ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7abb618046a4f458bb58e871afd2125.pdf
    • https://static.usrfiles.com/ugd/5899d5_043d1ea36c224aad849501540f6d4c7d.pdf
    • https://static.usrfiles.com/ugd/e2b09b_7d60a5ab81bc4d358402cdac130d925c.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_off000053c0.bin
208ac11174d92ab189f2a228194493276e08196946f0b7aa424807d401df4edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C0 5752 bytes
font_01_sfnt_off00006784.bin
ced93c792b9eb87552a7ad121d5773f194382aaae881ea88f90d28cc30b85757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6784 9892 bytes

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