Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8cf0d538d21b2c…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 03:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a31c80324bf79bff744ce35540deafdc SHA-1: 686581fbf714b94d87c4f5af5bd753ccd64cea3c SHA-256: df8cf0d538d21b2c6db099b0d75be76c4d5df776579f0a155365f51f0bfd48ce
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL and several other links to Shopify and usrfiles.com domains, suggesting a link farm or SEO poisoning attempt. The ML classifier also flagged this PDF with high confidence.

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.com/wix?keyword=ffxiv+sea+of+clouds+aether+currents
    • https://cdn.shopify.com/s/files/1/0433/7850/7934/files/65755592218.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/dipizu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1252/9055/files/74771945855.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/tozenudad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdf
    • https://static.usrfiles.com/ugd/fb5067_13eab2b5d6534d5ab3d5781daca9b358.pdf
    • https://static.usrfiles.com/ugd/63d3ad_369c0b424f8a448d823edd912e474cc4.pdf
    • https://static.usrfiles.com/ugd/bf650e_31eea05605704d0282f69f74acd60f23.pdf
    • https://static.usrfiles.com/ugd/1a89c8_67e5703cc72a4c5690bb637ed24b0113.pdf
    • https://static.usrfiles.com/ugd/de3d83_e44adba8deae4e4cb4ba92ce58a92efa.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd6c8e0a3cb7448b9d2ccae6fdfe30c9.pdf
    • https://static.usrfiles.com/ugd/5e81b9_7eee48d6fef3453e821caeda47490e98.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_off00006517.bin
90381a6b1f88196535615493e19a803eb794c5c8a99b2b86a768f1cd2181d80b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6517 5192 bytes
font_01_sfnt_off000076c2.bin
465b8e573a3328b69cd53384b772b4d045fbdb47ce4b7f842b45828dc6e42a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C2 9992 bytes

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