Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f51858c65f9bcd…

MALICIOUS

PDF

58.4 KB Created: 2020-08-29 01:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c43d41d2c3877ecfeaa04960cfc02268 SHA-1: 61ccace687aae6cb4e881860025887f8b7d7848d SHA-256: 92f51858c65f9bcd5ce532ee98908711b570c6ff41cf6278cfbf4c1d68e7526c
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting an attempt to trick users into clicking it. The presence of numerous links to Shopify and static.usrfiles.com suggests a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. No scripts were extracted, limiting the analysis of further payload delivery.

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=il+bardo+thodol+pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muxajuvorupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1991/files/14767833941.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/xasujatidudaxorum.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/12873521930.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/rejufenozokavaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/39234228105.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/1009/files/28189076057.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c222ce923834f9a9851a03de609e8c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_47066c2865884091bf15039c595cb4f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_404950b80e43407c894e7a4d44f9b7ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_897c27c9596f43bc9bb8ce3bb61fcd37.pdf
    • https://static.usrfiles.com/ugd/b8c837_36a7fb649d13425888fc86e76e9dddef.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ee64cc5bdc248c58947aa9b94236728.pdf
    • https://static.usrfiles.com/ugd/b8c837_e848af0a4e774fa497e7347473c442d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_3648b8f97c8f40eaa802007c7e96c16d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ffc.bin
8ce05ab635a6601089c2335e2145a052705e46f05d18d441928e2cd68aef2f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFC 5028 bytes
font_01_sfnt_off0000a109.bin
5de9503c1b48fdc0088118374ef7ccc664566bc3be0e64fee65bfe8c6fe08451
pdf-font-stream PDF embedded font (sfnt) at offset 0xA109 10676 bytes
font_02_sfnt_off0000b7f1.bin
cb90d45bb05e0da074af016e065ac4538addead1ee09353fb65cd1a45f811f5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 11112 bytes