Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f0fc9668af5b67…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 09:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a754b390f79a93e770155c5aa41d44af SHA-1: b163f9e7e0b4c5a4ea7b651eba5d5dda8488a061 SHA-256: 96f0fc9668af5b678f232b325c569ebe3cb2e4a2e129b729a6d57bea1d9064c9
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=dao+harden+leliana'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking URLs, 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=dao+harden+leliana
    • https://static.usrfiles.com/ugd/b8c837_68c0dbd9c27243958acf5572c98211bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fbe7438b0204febb7cdcfe7cc1f4c31.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9a76637d0b0456eb2d7cc0d08568385.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e20110fd41f4636b6ca4aa6395a8683.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/xovomunevimokog.pdf
    • https://cdn.shopify.com/s/files/1/0434/9624/3364/files/54885899107.pdf
    • https://cdn.shopify.com/s/files/1/0437/6975/7850/files/61929536504.pdf
    • https://cdn.shopify.com/s/files/1/0434/5610/2565/files/77402002016.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a1051f93a97403fbf82fefb01b3a263.pdf
    • https://static.usrfiles.com/ugd/b8c837_80a536615bd64cce9ba8fc579b7dd666.pdf
    • https://static.usrfiles.com/ugd/b8c837_70bdf55477a54863a2aab8f1195cbc7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b6c745be44b4880b4906a0e94e2621d.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/21657603939.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3816/files/algebra_2_textbook.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_off000065a7.bin
e597df871292d1c856e5951cae3431154d354551b554dbf9cb1c61ff5f44d083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A7 4732 bytes
font_01_sfnt_off000075b4.bin
697fe63893f13ea55f319cd575a16c52a73526d5110de2b9e55695ebeecf3c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B4 10144 bytes

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