Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4840eb0ddb5359…

MALICIOUS

PDF

55.9 KB Created: 2020-08-29 20:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a79cb6a5ce4ca271eb0aa489521ca681 SHA-1: 07f64c160097fbddb6622e467a6b053b8431aaad SHA-256: 4c4840eb0ddb53591466f99057cbefa2edef3a2ec2b47be273ed2348b7a99b63
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as SAT preparation material. The link directs to 'ttraff.com', which is flagged as malicious. The document also contains a large number of embedded links, many pointing to 'static.usrfiles.com', suggesting a link farm or redirection strategy. The ML classifier strongly indicates malicious intent.

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=barron%2527+s+sat+preparation+book+pdf
    • https://static.usrfiles.com/ugd/b8c837_c17d130facb3441690e2030855741e61.pdf
    • https://static.usrfiles.com/ugd/12f4eb_dda884ac5e8a44a7a1ea8bd1fcf8aece.pdf
    • https://static.usrfiles.com/ugd/b8c837_344215e993c5403eb9505e7d16cfb44e.pdf
    • https://static.usrfiles.com/ugd/b8c837_80aecbb1ed024a25a680bbeac7b79734.pdf
    • https://static.usrfiles.com/ugd/724bd4_6c1dfda8b4a14abfa63d0dcfa58294b8.pdf
    • https://static.usrfiles.com/ugd/429b25_676b6c6f42294d88b255c69cd7c4b059.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc9393871d7c427e87de3f48df214553.pdf
    • https://static.usrfiles.com/ugd/32777b_bfb9d7367bbe4a4cb0879873b7aec29a.pdf
    • https://static.usrfiles.com/ugd/b65acf_23fa779745d7417887f4d10cc99643f1.pdf
    • https://static.usrfiles.com/ugd/83b1b3_14f93caebeb44019822c8386642d20c7.pdf
    • https://static.usrfiles.com/ugd/e5a943_b2bc6f1b5c8c4fbb9df62a557d27e8bd.pdf
    • https://static.usrfiles.com/ugd/c7a620_13820a83e4924e049ed5bda23444dd8d.pdf
    • https://cdn.shopify.com/s/files/1/0440/7079/7462/files/imperfect_verb_endings_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0432/0234/7168/files/sims_4_grafting_guide.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_off00009ccf.bin
6fc185e26446e0d5a1588d684c48302c621741a7e7b87b53829fd8d4551fdba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCF 5288 bytes
font_01_sfnt_off0000aed9.bin
923402d59220bf59a99fd1fd8326e3f9c82bb463746b52e359d9ffde08cdf2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAED9 10784 bytes

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