Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcbbc3eb7f3211c…

MALICIOUS

PDF

48.4 KB Created: 2020-08-29 10:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab09e96d90b05788e8175b7185254149 SHA-1: b93600bfb1e09fdda153a9aec24f64f9c7a840e9 SHA-256: 9bcbbc3eb7f3211c2634196ea32ea640012e6e4b4415fee55a8d77da091c39f7
150 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, with a critical heuristic firing for a PDF link farm. One of these links points to a known malicious redirector. The document body, though partially corrupted, contains text related to 'Extraccion liquido liquido contracorriente' and mentions wkhtmltopdf, suggesting a potential lure or content related to the linked material. The primary attack pattern involves directing users to external, potentially malicious, resources.

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.com/wix?keyword=extraccion+liquido+liquido+contracorriente
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gotisirifiwixi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/curso_de_aprendizajes_clave_preescolar.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/byzantine_church_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/jivanujosedimerubozagoxu.pdf
    • https://cdn.shopify.com/s/files/1/0453/3098/9211/files/48782818722.pdf
    • https://static.usrfiles.com/ugd/b8c837_f69073f28ef946c89ce445ca2d95ee6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b07c5737e394be2a518881186bb99aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1b6ad2dd5b0418cac45e59abcc4f372.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/93334572562.pdf
    • https://cdn.shopify.com/s/files/1/0437/4793/4357/files/thiruvannamalai_annamalaiyar_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/gagevawanojibiw.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd3aae89f2d34463b24acea7a33b7b5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_acc9a0ef34ef4775a595f7283c0cb497.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d2b3070a139414cae34f2523698b6a9.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_off00007f95.bin
234f02e41deab84e329d693961d8c386df9b5f5a5bd579eaf83157141f6f979d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F95 4904 bytes
font_01_sfnt_off00009046.bin
c00931a5c583f69c5fe4383d99424604f85b8ce3d2a4ca3d586604b242792328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9046 11208 bytes

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