Malicious PDF — malware analysis report

Static analysis result for SHA-256 9861b5fc691c8ee4…

MALICIOUS

PDF

46.4 KB Created: 2020-08-31 11:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c822860c199df96d95e2f40127432dc SHA-1: 96a06e34c1b81bcb14da5abbe65d933eef36b7c6 SHA-256: 9861b5fc691c8ee4fca08ec4d243c05e41928c6c4096d15280629594944d5ab8
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, identified as a link farm. One of these links, 'https://ttraff.com/wix?keyword=engineering+mathematics+book+bs+grewal', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'engineering mathematics book bs grewal', suggesting a lure to entice users to click the malicious links. The primary attack pattern involves redirecting users to malicious infrastructure through a deceptive document.

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=engineering+mathematics+book+bs+grewal
    • https://static.usrfiles.com/ugd/b8c837_8c206f1c44d043f999a4bb4ab4a159e7.pdf
    • https://static.usrfiles.com/ugd/078c79_01be5c5ff91f475c9769e90dbf5bfd71.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b05a0a6ff51488e9516e0d1cbbee83e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c234936c15045bc8c2f5515c7c588c3.pdf
    • https://static.usrfiles.com/ugd/dd4472_a0a6ea7a07ce424680f9925ecaa08c5e.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_a546c8a136ec40e4bcd47e1fc368ed8f.pdf
    • https://static.usrfiles.com/ugd/191a6d_a41dcc31cc8f41a286b89530f59a78b4.pdf
    • https://static.usrfiles.com/ugd/2b25e8_f3105a262e6140659c474230ec1c7763.pdf
    • https://static.usrfiles.com/ugd/b8c837_e14852b5a150485fa3f37e2f1f1ae1b6.pdf
    • https://static.usrfiles.com/ugd/49be48_e967f340ad8e4c7e857d8a4a0dddfacc.pdf
    • https://cdn.shopify.com/s/files/1/0436/1689/5133/files/73359202229.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/tolabigepikuniga.pdf
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/13006350596.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000609c.bin
66b9d0c47bbd83cbdcdf188cab0e4a408b76b3b112b1441af430594de7b1b1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609C 5464 bytes
font_01_sfnt_off0000730e.bin
89454d8ece1be00d2333aac76955f46ed17c4d141322e635bf27f42efb43e54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x730E 2116 bytes
font_02_sfnt_off00007cda.bin
0ae634a2efb9ec78aaf9bc4f392be27d7deca84ca9deda7c7474404e49d4545b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDA 15040 bytes

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