Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5319a4663f5d00…

MALICIOUS

PDF

39.2 KB Created: 2020-09-01 20:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06e85f2b8d1a8c9eb81ccefec2587211 SHA-1: b0dfeac370d752caab114b2df93d6f3f8123c078 SHA-256: 9c5319a4663f5d000a1bfa60ba2b23f0690968270e807fafab16db17796e4988
150 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, identified as a PDF link farm. One of these links, 'https://ttraff.ru/wix?keyword=chlorenchyma+and+aerenchyma+are+modified+forms+of', points to known malicious redirector infrastructure. The presence of this malicious redirector, combined with the link farm, strongly suggests an attempt to lure users to malicious sites. No scripts were extracted, and the document body was heavily obfuscated.

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/wix?keyword=chlorenchyma+and+aerenchyma+are+modified+forms+of
    • https://static.usrfiles.com/ugd/7ff653_57e9a480fe144821b13764907a5bb840.pdf
    • https://static.usrfiles.com/ugd/de60da_106eb82db00c483c8bd2298ffc672940.pdf
    • https://static.usrfiles.com/ugd/d5415a_9503e48b0df44f11ab422d25c0bbbb64.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_a2250632fc214a338b3a8de3b514e7ac.pdf
    • https://static.usrfiles.com/ugd/dd4472_858f6c3839414c5982e3d7744f9562a2.pdf
    • https://static.usrfiles.com/ugd/a2e20a_0687b6a6f56e441ba427be72ccbd6465.pdf
    • https://static.usrfiles.com/ugd/590778_4ebf7b50ef674cc8a3de89ec7df1fbd3.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/wiwapononu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/wexagupo.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_off00005c39.bin
06a419be5fad5ebc1a35e1a619fb8030d70554ad1309bd04816fce9b6691ffe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C39 5268 bytes
font_01_sfnt_off00006dfa.bin
8b1565338890ecc6901ec82329654a9366c691f2c984bb15004dd016a4887d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFA 9984 bytes

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