Malicious PDF — malware analysis report

Static analysis result for SHA-256 86984df8a166b7e6…

MALICIOUS

PDF

39.2 KB Created: 2020-08-29 18:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bca2314ca2b221beff4b9ee3898902fe SHA-1: 594e04879f2f38d748a6eebe0445539febf11671 SHA-256: 86984df8a166b7e60539d6a4334562144839294507fd768a440cd610b6a30292
150 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 a URL that appears to be a lure for free music downloads. The document body, though heavily obfuscated, contains the same URL and text related to music downloads, reinforcing the social engineering aspect. The presence of numerous other PDF links, many pointing to static.usrfiles.com, suggests a link farm or a method to obscure the ultimate malicious destination.

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.ru/wix?keyword=abirami+andhadhi+tamil+mp3+song+free+download
    • https://static.usrfiles.com/ugd/b8c837_2f4c05d4cd9f4809ad1a8fb468ce694b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cc6f02fb8b14d88ac3c5a7bb30b2a08.pdf
    • https://static.usrfiles.com/ugd/b8c837_6aecdae74ae14960af658b92618a68f8.pdf
    • https://static.usrfiles.com/ugd/0049ca_d3307c15c2ef4ae0b51ae2b4ba976c36.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5293/files/69662691497.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5911/files/83470849045.pdf
    • https://cdn.shopify.com/s/files/1/0440/4966/2117/files/arema_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba6610f8cbdf44698a1002ca71169d89.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fb2f9cbee6942548e2d36f1f208073c.pdf
    • https://static.usrfiles.com/ugd/b8c837_042c9caf668d4f54969743ef43a4af95.pdf
    • https://static.usrfiles.com/ugd/b8c837_88b9ef4220b64299b85ebb8981df6e3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_062cbe3a84a9413e9a43fb174aae8731.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_off00004f6f.bin
45df848b5db7aefa5c8af0dc5bf296ad6cdb686f4fcd90b47d7dd4141cc1ecdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6F 5840 bytes
font_01_sfnt_off00006324.bin
57813855af9c39888f1469f1dda4ad139d2e82984ecbd9c8bc2f9a67bc1cb2fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6324 14288 bytes

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