Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b4febcfe56a333…

MALICIOUS

PDF

36.8 KB Created: 2020-08-29 22:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1747dd5fe2d6380c3d855f64e7ed988 SHA-1: c2e1178f5cb4fde65d5980c4b4e098dddbe6a307 SHA-256: 43b4febcfe56a333406ac042b6670d7409f35f354c6ec31568d601522ff1de8e
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=napa+lynchburg+va'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs hosted on static.usrfiles.com. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the target URL, suggesting a lure to a malicious site.

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=napa+lynchburg+va
    • https://static.usrfiles.com/ugd/b8c837_5be36ac1631b4b15bfdcc26c2d20537c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f36caf66d4440cc9c4ce14ee9fbaf8f.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_ef20975b7c434742820bd57520f30df8.pdf
    • https://static.usrfiles.com/ugd/b8c837_778fabad083c45bcac7329df819bf7d4.pdf
    • https://static.usrfiles.com/ugd/c836c3_59405d0517604fd199a7d62b4bec049c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ccba908413f4b75b4dbe3ec35274bd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_19e593bc5c9b4d1da50ad1c063c1cd0a.pdf
    • https://static.usrfiles.com/ugd/756799_d6645455b02543a49ea356bb6dd36f10.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b1a0131686e46e4a3684d376a4be5a1.pdf
    • https://cdn.shopify.com/s/files/1/0428/6912/9372/files/69444986784.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/23833171414.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/6483654426.pdf
    • https://cdn.shopify.com/s/files/1/0434/3008/4760/files/6323836830.pdf
    • https://cdn.shopify.com/s/files/1/0454/4416/9878/files/53468367943.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_off0000516b.bin
be97bed48b2abfede14f1042ce2162084a818f8aeef21fae085b6efcbfee1c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x516B 5288 bytes
font_01_sfnt_off00006367.bin
77c10b7a64d94e8fde2bf40c4edca7f4d305ce825a8e8db0ba5ff3afd261c979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 10932 bytes

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