Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9c8515521b3a5f…

MALICIOUS

PDF

36.5 KB Created: 2020-08-30 20:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b74a7615cef16b9f61011b821827dce9 SHA-1: 9ad41fe350b7216a5223056733d0e2f9b9effbff SHA-256: ee9c8515521b3a5f9ba1814793391ffad7e65840359d74e6182d424044a144e8
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=health+assessment+in+nursing+5th+edition+pdf', which is also listed as a malicious redirector. The presence of numerous other links, many pointing to 'static.usrfiles.com', suggests a link farm or SEO poisoning attempt to lure users to malicious content.

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=health+assessment+in+nursing+5th+edition+pdf
    • https://static.usrfiles.com/ugd/b48b60_f1e37699b5b046cb93abf75174a72f7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcdcae093c5d4f0183a0be9bb8c53f65.pdf
    • https://static.usrfiles.com/ugd/bfbc46_cea0595956db4e498e66267bf60a5b9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_51e18f378204404bb747b8fc34048345.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/besumupovulakobutowuxatup.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/69913231302.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8775/files/wasidifulerutagi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/leave_application_format_for_employee.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2fb51372f29401490b51c546366477a.pdf
    • https://static.usrfiles.com/ugd/865d50_1bcc6fcae4d34f5ca8488a441acd11ed.pdf
    • https://static.usrfiles.com/ugd/d4da64_e8dde384ff0c4d27b5caff8554b63a13.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_off00005117.bin
d2de2f3ccba65535558714d0d91aec3d18909b4aae154c632d5be05ea72aaa56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5117 5540 bytes
font_01_sfnt_off000063c2.bin
c64ebf34f85e079e90df1122ea336963ae016cd9f209e332fa9ec2c172aa0adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C2 9808 bytes

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