Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a2400dcb2ad5bd…

MALICIOUS

PDF

38.4 KB Created: 2020-08-11 22:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89bf129070369a3132091072c15db7fd SHA-1: fdf54ca0e1c6e0c75ede690fbae80ee56d21c438 SHA-256: c8a2400dcb2ad5bd90b265ade622a1c162697c6fc50c1b479cef60f9f764353c
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=dsm%20v%20pdf%20completo%20descargar%20gratis'. This indicates the document's primary purpose is to redirect users to potentially harmful sites. Additionally, a heuristic for a PDF link farm was triggered, with numerous external PDF links embedded, many hosted on Shopify. The document body, though heavily obfuscated, contains text related to 'Dsm v pdf completo descargar gratis', reinforcing the lure of a free download.

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/wb?keyword=dsm%20v%20pdf%20completo%20descargar%20gratis
    • http://files.mealsformedicine.com/uploads/1/3/0/8/130874026/9018e98aba1.pdf
    • http://files.k9rehabvet.com/uploads/1/3/1/6/131606583/gatuzeluvobibejev.pdf
    • http://zesibobo.drcarolineclarke.com/uploads/1/3/1/8/131857334/a39dc3f1.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/66918568517.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/kirovagaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8673/files/15471250552.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1885/files/uninstall_node._js_mac.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/39875861127.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3366/files/one_line_ascii.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40573574370.pdf
    • https://cdn.shopify.com/s/files/1/0439/1573/9304/files/jurnal_aspergillus_flavus.pdf
    • https://cdn.shopify.com/s/files/1/0433/9227/0494/files/40616053562.pdf
    • https://cdn.shopify.com/s/files/1/0435/3975/9255/files/crack_office_2016_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/8469/3160/files/losapovapis.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8827/files/30568548754.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.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_off00004f5b.bin
d2cec17eb0bb2f47b33cd9a478d167091f8a394948834ff4dbbb3a4493149481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F5B 5532 bytes
font_01_sfnt_off0000621e.bin
0180b980db8078fef359290fd75fdc5e0fe8b6b1cdd07f768a2b36a87e4d287d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621E 13468 bytes

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