Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f768c613a5f095b…

MALICIOUS

PDF

43.7 KB Created: 2020-08-30 12:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f16ee1b50aecd167ef5e63f7f4c7c782 SHA-1: a53ba3368552e37ca6e5deabe143fd7fe15526c7 SHA-256: 2f768c613a5f095b56113bfb4bbc48a9283231d5c9eebd6de870fd89e6a74208
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=el+principio+del+placer+jose+emilio'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking PDF links, suggesting a lure to a malicious site.

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+principio+del+placer+jose+emilio
    • https://static.usrfiles.com/ugd/b0b521_21212fca2f8743f5a90625bb5e594a2d.pdf
    • https://static.usrfiles.com/ugd/9b33c5_3a7f95782912484bb54dbb9a8e05ceaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddcf71396a3c463a99180d85e72960ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc303731d6eb4686ac276f30f5750e27.pdf
    • https://static.usrfiles.com/ugd/b8c837_05c496a00f5f4ccaa839a07e28fede36.pdf
    • https://cdn.shopify.com/s/files/1/0461/9593/3347/files/naruto_ultimate_ninja_storm_apk_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/5452/1758/files/tobozitex.pdf
    • https://static.usrfiles.com/ugd/b8c837_eab64c9ed9e54033973e97e9cf7650f1.pdf
    • https://static.usrfiles.com/ugd/40512e_4c7a15e7dc4b400d9333413b27095e59.pdf
    • https://static.usrfiles.com/ugd/b8c837_09334912cfe84fe58a2eb31cacd0fefb.pdf
    • https://static.usrfiles.com/ugd/9757e7_6d0bc6390c8e49228bde7eaac2f04797.pdf
    • https://static.usrfiles.com/ugd/8b2c09_078fddcc9fad4deb92cfe9035864d9fd.pdf
    • https://static.usrfiles.com/ugd/c618e9_54dd60f0f31b45d9a772ab97c5c69941.pdf
    • https://static.usrfiles.com/ugd/b8c837_30e52e76c26a4a27a458c873ae60bbbf.pdf
    • https://static.usrfiles.com/ugd/67e251_65e13b950aad4758a7d3369257fff395.pdf
    • https://static.usrfiles.com/ugd/b8c837_feb4ded13b18475f87ee62feb8003bf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_31abda09386c4690a9519d8b20c6ffb2.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_off00006962.bin
a012466359cf6a2af10015dc8f559e9c5b70cc00fb25161edd8ca8df9149d20c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6962 5252 bytes
font_01_sfnt_off00007b22.bin
3ac65f8dbe2a1319dd84104998030cca107e0fc9bbc6026b49cc9a8092640b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B22 11336 bytes

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