Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37eb41517b4e54f…

MALICIOUS

PDF

55.4 KB Created: 2020-08-29 21:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4a07c7465399858894c80d5e75b0730 SHA-1: 568f3f424607a41cb86d5f84633e7a79fecd56af SHA-256: b37eb41517b4e54f8ae72dbaca0bea1a95b045f733b6388899bfa8325d60397c
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 a software download for a PDF reader. The link, https://ttraff.cc/wix?keyword=logiciel+pour+lire+pdf, points to known malicious infrastructure. The document also features a large number of external PDF links, many hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to increase visibility.

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.cc/wix?keyword=logiciel+pour+lire+pdf
    • https://static.usrfiles.com/ugd/ce0e6d_99855bee10e54da2b59ebfcb9648f4f3.pdf
    • https://static.usrfiles.com/ugd/f4de5e_86b3ceec758e40d8841d57aa51879136.pdf
    • https://static.usrfiles.com/ugd/b8c837_a21f66a9ab444b3892ee80a0ac0a6d98.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb9be28f7c82494aaca9c936f5d3cb08.pdf
    • https://static.usrfiles.com/ugd/b8c837_4275fff636264bcd9c8b473c06ad75c9.pdf
    • https://cdn.shopify.com/s/files/1/0436/7892/4953/files/Adolescentes_boazonas_de_calas_just.pdf
    • https://static.usrfiles.com/ugd/b8c837_c79c3b56b2d8456cb416a272aa5cb81e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2340e696f5dc42019d3008791caf6d4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec98312f23d4465883f3d64519f1ab75.pdf
    • https://static.usrfiles.com/ugd/b8c837_d76eba5b98cc400d9f5d9aae50758baa.pdf
    • https://static.usrfiles.com/ugd/822ecd_41a30e82c2a64faf919a7da75a1f4788.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf47ea6b1b8442ee9c2bcdc31cafbbe3.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4ef48db61934a5e8163bc0ee5d50ce6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a84918c81c784b88a640d33f38f09a31.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_off00009aab.bin
64a3006a20824818763e94acc600ec794742df982390aff80235a52fd3e9e258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAB 4876 bytes
font_01_sfnt_off0000ab54.bin
29d56406b94bf3c19eb537fd037d2c6ab9420827c2c882e9dc0a689de2ff9b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB54 11972 bytes

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