Malicious PDF — malware analysis report

Static analysis result for SHA-256 59da6a7cda41f148…

MALICIOUS

PDF

71.3 KB Created: 2020-08-29 19:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fa5ee57f3ffad48ecac218cf4bf4000 SHA-1: 43f1eeedc75cf37e13048bd71347053b0dc0c0e2 SHA-256: 59da6a7cda41f148bc2cb8cb629ec272ed641ebbfc8b421851e087d6fd52f687
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=clue+scroll+osrs+hard+guide'. It also exhibits characteristics of a PDF link farm, with numerous embedded links. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The file is generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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=clue+scroll+osrs+hard+guide
    • https://static.usrfiles.com/ugd/c1de29_f2c1acf410c14c3288777e578784a2d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_08eeb43d05254791a498f9333ada8f1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_04c8d2ed750348cc964112c5802ceda1.pdf
    • https://static.usrfiles.com/ugd/b8c837_3fb184f1e6c64fce87677d71e045335f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0d3117e7e2648b78f594d0bbfa31701.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5f08c09417a4dd1b0fbff13dde06744.pdf
    • https://static.usrfiles.com/ugd/dc98cc_e8291607bf8b4168ba5f0b6796804446.pdf
    • https://static.usrfiles.com/ugd/b8c837_71eaf389f3d94dfd8354dcb8484d49b1.pdf
    • https://static.usrfiles.com/ugd/cc03df_ea5df9c081e64038bd8852d6ed93e82e.pdf
    • https://cdn.shopify.com/s/files/1/0434/0832/6813/files/11409675721.pdf
    • https://cdn.shopify.com/s/files/1/0464/6676/0856/files/3646959390.pdf
    • https://cdn.shopify.com/s/files/1/0440/4350/1733/files/75035180720.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/besutaxabidorojevurulin.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_off0000d695.bin
9f84e8bd04d87a684cc4f3d87cf7b3ef46a745ce58b5febf6e6cc2e19c453d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 5104 bytes
font_01_sfnt_off0000e7e0.bin
29888c8ab62dacfb50e89810e53e9e4f84bddae5794c7eb69a77d512cc1bad72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 12688 bytes

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