Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f54755b32f9800…

MALICIOUS

PDF

40.3 KB Created: 2020-09-09 08:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02aff12de69dd5022962f9537d2b1dc0 SHA-1: 0d9aafa7711dcbaab7b76a5a9f7b798068210bf7 SHA-256: c9f54755b32f98003684f82deccb6864b6472bf8cee6e9793f593e7a0e7f6fd9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One prominent URL, 'https://ttraff.ru/wix?keyword=aua+guidelines+cryptorchidism', is flagged as a malicious redirector. The presence of many links, including those pointing to 'static.usrfiles.com', suggests an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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=aua+guidelines+cryptorchidism
    • https://static.usrfiles.com/ugd/6a22cb_c34d3f374a4042a9b6fbc803c556debd.pdf
    • https://static.usrfiles.com/ugd/f80014_6d9639801dae4fe5a8311422c255bc7a.pdf
    • https://static.usrfiles.com/ugd/2072cd_54c0b62b9ee341328c5bdac40e2a7b25.pdf
    • https://static.usrfiles.com/ugd/8ade13_3ccbef7584ed4e408c32fdfdfa3af749.pdf
    • https://static.usrfiles.com/ugd/e9cba9_126a38ad552a46128a26ab3e4a5a8a9a.pdf
    • https://static.usrfiles.com/ugd/a1fb72_d3d1c31d70674b8190c88d801a15aa52.pdf
    • https://static.usrfiles.com/ugd/35ddae_0f9b9506ffaa412a836477730ab59340.pdf
    • https://static.usrfiles.com/ugd/dcbeda_5e908d57bdfc4a69b977f750f39a6b29.pdf
    • https://static.usrfiles.com/ugd/f459ea_9374f8d30e0f4eaebf99f7b35240703a.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/jajozenuzuxogumatosut.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9455/files/can_you_anonymously_report_someone_to_irs.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_off00005ec9.bin
54d1b8c95bca10fc255df438ee9a6b57fe63a6404d046195cdf7e197189f78ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC9 5576 bytes
font_01_sfnt_off000071a7.bin
cbd85b09a792a84629981aa26f8346e1de5a19846e3f1b0b72a279e6d91f760a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A7 10304 bytes

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