Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf204dc528cf2ee…

MALICIOUS

PDF

34.2 KB Created: 2020-08-30 14:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df40b28bda7df39d7811c0c7da02124a SHA-1: f85418068cb93c0a0ea24d7538ace29fa72796a0 SHA-256: 3cf204dc528cf2ee13f6071add15186be3b676ade86d499286216e72277f24ec
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs, a technique often used for SEO link farms to improve search engine rankings for malicious content. One prominent URL, 'https://ttraff.com/wix?keyword=boone+kurtz+contemporary+business+15th+edition+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure under the guise of providing a business textbook PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=boone+kurtz+contemporary+business+15th+edition+pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7605/files/zefesogunuwaxobuzow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/toro_snowblower_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1944/files/nitudix.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2764/files/simple_reading_comprehension_passages.pdf
    • https://static.usrfiles.com/ugd/b8c837_42a66ad919d34360ae6ce3c67c1ee1a9.pdf
    • https://static.usrfiles.com/ugd/24853a_22d38cbad8bd42f495a31b7936ff0f22.pdf
    • https://static.usrfiles.com/ugd/b8c837_e24ce86c8fa04a588c867cc4fe658ea9.pdf
    • https://static.usrfiles.com/ugd/12dc78_185c245d1cc44d94b508c494ba55aabf.pdf
    • https://static.usrfiles.com/ugd/696b8a_3ab76ef2ccff432f8d15b74e6817ad1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e5b59c4a2642a3954808d6d017661f.pdf
    • https://static.usrfiles.com/ugd/b8c837_324eabb27b67418593593c50426704ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6d52c594b6346f6a852138a574443f8.pdf
    • https://static.usrfiles.com/ugd/b98abb_a3e2a659860246198f80292f5d0526ba.pdf
    • https://static.usrfiles.com/ugd/2f8cea_27f4d1a63d0f442f823370c0ff354933.pdf
    • https://static.usrfiles.com/ugd/b8c837_3583a24750774a0a90537facee6b04d2.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_off00004649.bin
820c94079e976ddae6a5d37cfc040707cc1c6257a44e582c5ab7561c873b3393
pdf-font-stream PDF embedded font (sfnt) at offset 0x4649 5944 bytes
font_01_sfnt_off00005a6f.bin
75a9203d8aea80a04fccd6bc7235fd099112992a2c4c50bbad525a6af6498ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6F 9724 bytes