Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fd63e29e46ee24…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 05:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9f41909622da51bdb7df02bee9680ef SHA-1: 83859df265950ae5137c8d1256c1b2ec1a87dda6 SHA-256: 32fd63e29e46ee245560900bc3b70ccd2dbc1a6a3bfd4d428843c6c8928c934b
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a link farm of numerous external PDF documents. One of these links, https://ttraff.cc/wix?keyword=el+modelo+atomico+de+sommerfeld, points to a known malicious redirector. The document body contains garbled text and embedded URLs, suggesting an attempt to obscure the malicious intent.

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=el+modelo+atomico+de+sommerfeld
    • https://static.usrfiles.com/ugd/b8c837_06f3629ff1844fcb9a9f43b560af8846.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_86017adecd9a44e8b8fd815391de67be.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae1a318ed707480780e7c1d766f775bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6179065a2cd446ae85e51438e308646b.pdf
    • https://static.usrfiles.com/ugd/07625c_e80c6c2db5ad4c13bb9ea17c9929c887.pdf
    • https://static.usrfiles.com/ugd/accd1f_edac7610fb104100a8b2a1ef9966e844.pdf
    • https://static.usrfiles.com/ugd/69b86f_5c0d72d440c24ed381ddb2c67ab9cdc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f16d3cd835f8488aafe8e3267766a5b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_83f0769e4102485a8a3e32a7e1e7d435.pdf
    • https://static.usrfiles.com/ugd/69b86f_db553f14978c49d9b0cdbe9125bb9b7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a79fbc4fff6349d8a55de628fba08f0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_23bbc3f41b1c4d88aa8a33f05ba5bcb1.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_off00005bf0.bin
de9508a2069b363c0541c920885750aefb4cf3a6ca48ec2e530eb3bc2cc9abd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF0 5124 bytes
font_01_sfnt_off00006d43.bin
b6b721d672b26668d078ef59e65a96be5a5e5ed95f57ee4cc20ecf9b2dde7a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D43 10648 bytes

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