Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca89094e5e7bf2d2…

MALICIOUS

PDF

41.8 KB Created: 2020-08-29 21:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 755b3f1140f9abb62592ecfca4e3740b SHA-1: cbdb48b2cf098f31026b34a0b4ae913f8b400792 SHA-256: ca89094e5e7bf2d2b2a82fd12ece5a623aa2db93b78e4c5d576adf567a5e8839
120 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, disguised as a reference to 'Klein organic chemistry 3rd edition'. This heuristic firing indicates a social engineering attempt to trick the user into visiting a harmful site. The document also contains a large number of links to external PDFs, many hosted on static.usrfiles.com, suggesting a link farm or redirection strategy.

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=klein+organic+chemistry+3rd+edition
    • https://static.usrfiles.com/ugd/b8c837_5cd6842a3f7347c39226023b7cdfbb40.pdf
    • https://static.usrfiles.com/ugd/b8c837_47b75c2ec8b442cbbc60aa9968ffe8a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8e06fc5fe7142e8833420b4b276a4ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ca4e25db02b4d33b86bd91d459775d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_597443141cdd4dd08befe21a0b7ad014.pdf
    • https://static.usrfiles.com/ugd/3aca14_33512cb36b0d45ed82994f0e92b55d6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9efea030c12f4ddcbf79c469a37b49f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6077b04fa1541dd9a2ed7e155c99ac8.pdf
    • https://static.usrfiles.com/ugd/b8c837_42efeeb58ba64490b56b5e5afc6089a0.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6672/files/blank_calendar_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0470/6477/6872/files/polomaveve.pdf
    • https://cdn.shopify.com/s/files/1/0440/6578/3958/files/genuineness_of_assent.pdf
    • https://cdn.shopify.com/s/files/1/0464/2449/0136/files/chew-_wga_v0._9.pdf
    • https://cdn.shopify.com/s/files/1/0432/8921/5129/files/87924763844.pdf
    • https://static.usrfiles.com/ugd/b8c837_57667f8d80424d4aac21d0cdd7d0039f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9f31b5c000541bf926c45ab92b548a5.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_off000065cf.bin
b93669b30058beb3e25b6e970999593d8fa880325fd1c2f96e9920a16e812488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CF 5588 bytes
font_01_sfnt_off000078a6.bin
2990604de5679146b8cdc83e95c99abd4a901288d136bd66f0f1c0c0d86fd92d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A6 9860 bytes

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