Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc2e53adf5950ec…

MALICIOUS

PDF

42.5 KB Created: 2020-08-29 18:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cbb148cd2418442ec04ca0ab747ea5d SHA-1: f2a21a2a4d9f23b9c4a2cdf54a2c34078edde63e SHA-256: cdc2e53adf5950eca8e40ce31211a1d6c2077a37c9c74d7b4eb4a2c85f179c83
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing for a PDF link farm. One of the primary links, 'https://ttraff.cc/wix?keyword=exploring+anatomy+and+physiology+in', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and other benign-looking PDF links, suggesting a coordinated effort to drive traffic to malicious infrastructure. No scripts were extracted, and the primary malicious activity observed is the redirection via embedded links.

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=exploring+anatomy+and+physiology+in
    • https://static.usrfiles.com/ugd/b8c837_77504d023db242a9a64d9c634bbc174b.pdf
    • https://static.usrfiles.com/ugd/accd1f_fe07f4a0d27046b6ad2a7fea5a2515a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd07b4a2eac2446b842baa1a30769680.pdf
    • https://static.usrfiles.com/ugd/b8c837_a14da25cc78048a3a60dba82ab30c952.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/71077850139.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/befevosodop.pdf
    • https://cdn.shopify.com/s/files/1/0438/4443/6128/files/nixomekejikozopifox.pdf
    • https://static.usrfiles.com/ugd/b8c837_7153104b2f4e4ed4bfcd29b37267f57e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8cd22d591d64e009cedc85c9e5d6fd6.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ac85aa85a6c4456be04a1ff789b1937.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/calculus_solved_problems.pdf
    • https://cdn.shopify.com/s/files/1/0429/1556/1638/files/didijolixoxulixag.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0835/files/nabaxupira.pdf
    • https://cdn.shopify.com/s/files/1/0435/9477/6739/files/ankle_sprain_rehabilitation_program.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/48971636367.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_off000064f6.bin
803d558188ebcdff9355c077f17f33334d714aa0d51cf94206b2ba7f54cc4586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F6 5500 bytes
font_01_sfnt_off00007786.bin
d5d7f07d5d4b69ced0867168141a63db79e7159fd8268f08e9cef02310e92aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7786 10560 bytes

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