Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5a63a810fb918f…

MALICIOUS

PDF

70.5 KB Created: 2020-08-30 16:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2584a5a02fb5e579589eb9ad976cae4 SHA-1: dcb5852677d47efbf07011bd3958318a91171844 SHA-256: 2c5a63a810fb918f43bb0219c6ef24b871116f72c3698cf3a85faf7e923d1aa2
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=bell+3000+modem+manual'. This URL is presented within the document body, disguised as a modem manual, indicating a social engineering lure. The file also exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to broaden distribution or manipulate search engine results. The ML classifier strongly flags this PDF as malicious.

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=bell+3000+modem+manual
    • https://static.usrfiles.com/ugd/565485_5bb0368fe6134da8b6c2f13bae8e1516.pdf
    • https://static.usrfiles.com/ugd/01bc73_6487bd067b584f0aba507da2868c4939.pdf
    • https://static.usrfiles.com/ugd/b8c837_59d9d69230334a6b8ca06d00fe49907e.pdf
    • https://cdn.shopify.com/s/files/1/0437/1723/0741/files/71382766260.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/4622688052.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/69546911167.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/cancer_de_colon_fisiopatologia.pdf
    • https://static.usrfiles.com/ugd/b914b5_9eb5cb81ebe34db38ea0a6769cf820e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_56e8a6cd52d94eefa999276ff9483687.pdf
    • https://static.usrfiles.com/ugd/a86d68_34e9ab2ea61740ac9df1a16d4944e322.pdf
    • https://static.usrfiles.com/ugd/575363_69a50cc79a314121ac3fdccccefe2fd0.pdf
    • https://static.usrfiles.com/ugd/73f3b0_29618df826f44558afb17c9e697ab1dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb9e44ca385e449696d4bb10c0f6fc92.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_off0000d025.bin
d745f245f2733a3b90ff9f69cf3bf0895faf9886135ab303f034f73e312e6dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 5052 bytes
font_01_sfnt_off0000e144.bin
2ff84a3f7e503b53a31b3f33e1e2bab72f99ab77f121a0e154708aafd5156864		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 13996 bytes

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