Malicious PDF — malware analysis report

Static analysis result for SHA-256 3351fe2a17e7fe81…

MALICIOUS

PDF

69.3 KB Created: 2020-08-29 23:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 197747cc93c30f54148fa27a7f8cd168 SHA-1: d27b9bebf36cd6dca678f217e5fe3c7c2a66aade SHA-256: 3351fe2a17e7fe81679ae341c04bf7bb5c6a21c76c3530894f6791d6aa332612
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL which likely serves as the initial lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the file type is PDF, suggesting a phishing or redirection attack.

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.cc/wix?keyword=resumen+del+periquillo+sarniento
    • https://static.usrfiles.com/ugd/b8c837_6fa8e13d06d84d439f7196995f227ae9.pdf
    • https://static.usrfiles.com/ugd/74a852_35b2004bfea34ade9294f86f5ecbf31c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c023e3d7c11144bf9482ed1e47cbdfe9.pdf
    • https://static.usrfiles.com/ugd/f0e51d_f79208cc70094ce2b054af314616df88.pdf
    • https://static.usrfiles.com/ugd/0c41e7_7666d6a6dd8445d0acd1115c5a05e30e.pdf
    • https://static.usrfiles.com/ugd/760101_668f61b4fec04c51961f3fca89b5cc18.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc37905c63864e108382a3c83f22ecf5.pdf
    • https://static.usrfiles.com/ugd/353d00_00037f22b63044a7bfde80f6cf0e122b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b7039da0d7347e782c7dc53500da723.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demotufilonameviv.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3640/files/obras_de_anaximandro.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_off0000d2a1.bin
dd2e2f2a0ccf7b4edf080c4a367a1405a8082c53fe4d803ab259913d7a1180ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 5240 bytes
font_01_sfnt_off0000e451.bin
43bb97b4d80f28e0dffe2884bf821a3f88f55625b47ce64d76c56ff07c3b7a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 10588 bytes

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