Malicious PDF — malware analysis report

Static analysis result for SHA-256 8909b90d3398336b…

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 12:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48c8b186e9479680166ada89b39e9a86 SHA-1: 1be7a624eaaf965f5f561f217c292a824216cec0 SHA-256: 8909b90d3398336b34819ee73b29f2ed77175674e2b49a1888ded63c127236fb
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a link farm containing numerous embedded PDF links. One of these links, https://ttraff.com/wix?keyword=gazelle+freestyle+glider, directs to known malicious redirector infrastructure. The document body contains obfuscated text and references to the redirector URL, suggesting an attempt to lure users to malicious content. The file was generated by wkhtmltopdf, a tool sometimes abused for malicious purposes.

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=gazelle+freestyle+glider
    • https://cdn.shopify.com/s/files/1/0431/6489/3344/files/possessive_nouns_1st_grade_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/5349/0071/files/xewixonasag.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/31085364099.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4167/files/curso_aprender_a_dibujar.pdf
    • https://static.usrfiles.com/ugd/1f2646_5c30f251eb7f4d88b0e53d5654ed53fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_6741f90b353c4d09a2050c093fafc4bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2bf04599d58845da978ab4e18c8ee375.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e07668e1ce740638d2bf153e34a7753.pdf
    • https://static.usrfiles.com/ugd/b8c837_b65c760b31a648a095036790a0873184.pdf
    • https://static.usrfiles.com/ugd/b8c837_35d3db8336d54936aa31c4e28ce2f8f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_915fbe5ade9346ce8f67f7844ead7270.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_off0000680d.bin
d45a7d88d0a25c5f3a41b446397ee86740811c445dabf29a66e133ab9f802350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680D 5256 bytes
font_01_sfnt_off00007a11.bin
f78e3457d4e2f9a8a88595dd5d7fb1b60745ed30c185c86f4a75a43eef4c0bfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A11 10228 bytes

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