Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca168143d5a5d929…

MALICIOUS

PDF

41.5 KB Created: 2020-08-29 04:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bae9871e9d30da1e92fba10f3231d51a SHA-1: d6efde586cd5763b0fb7f655c7ce05f123f22ba0 SHA-256: ca168143d5a5d929a8b4a3ac31721c7331151247d8c31eca0b3590d5a773d2e0
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which point to redirector infrastructure. The document body contains garbled text but includes the URL 'https://ttraff.cc/wix?keyword=hispano+quarto+de+bolsa+de+com%25C3%25A9rcio', which is associated with malicious redirectors. The presence of numerous links to external PDFs, including one hosted on 'static.usrfiles.com', suggests a link farm or redirection strategy.

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.cc/wix?keyword=hispano+quarto+de+bolsa+de+com%25C3%25A9rcio
    • https://static.usrfiles.com/ugd/b8c837_676b10df6a5a49e8b9d0f0192a7b4ade.pdf
    • https://static.usrfiles.com/ugd/b8c837_c50174c56f114363ba13c083e23cefd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_60ba5be9e81e4bdf9057e0ef88e496fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_194942f9fdbf41b7bc0ed295b84cb7f5.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/14345901407.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/effects_of_air_pollution_on_human_health.pdf
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/46698680309.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/82517939561.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/bluestacks_offline_setup_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/apple_music_gratis_apk_ios.pdf
    • https://static.usrfiles.com/ugd/b8c837_7155f7c6b781428d89e675d6822e7004.pdf
    • https://static.usrfiles.com/ugd/b8c837_9aa987e31c1e4cac87bde6b4e79663a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab76910009f1403cb19aff60a750fa02.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_off00005dd4.bin
4792d13f4ce99c38096d666e5e4ae6483ad5f9360e1aa8086efb5042462ea42b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD4 5588 bytes
font_01_sfnt_off00007061.bin
bd570cb26d00faf45672ab50195ea644a76f4f7e1da5994fef66875ca846f266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7061 12760 bytes

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