Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58d9e9770b68d4c…

MALICIOUS

PDF

16.5 KB Created: 2019-04-30 04:45:09 +01:00 Authoring application: mPDF 5.7
MD5: 7c38cacc24d2793459256c76ad11f8a7 SHA-1: 62d683049986ccf35909f99ce102bf4537f1da6a SHA-256: a58d9e9770b68d4c26555c2b72f1d3bb2dd4905b92dd16d2c9dc548fb6e64cdf
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of embedded links pointing to external PDF files on the domain 'muicuiu.dumb1.com'. This heuristic firing, combined with the ML classifier's high confidence, indicates a malicious intent to redirect users to potentially harmful content. The document body itself is heavily obfuscated and does not provide direct clues to the user-facing lure, but the link farm strongly suggests a SEO poisoning or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

Heuristics 2

  • 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 http://muicuiu.dumb1.com/7a06a02a02a05/Sapphire-Blue-Precious-Stone-Trilogy-2-by-Kerstin-Gier.pdf
    • http://muicuiu.dumb1.com/1a01a09a06a03a00a08/Sapphire-Blue-Gem-Trilogy-2-by-Kerstin-Gier.pdf
    • http://muicuiu.dumb1.com/1a07a05a05a08a08/Emerald-Green-Precious-Stone-Trilogy-3-by-Kerstin-Gier.pdf
    • http://muicuiu.dumb1.com/2a06a09a04a09a01/Dream-On-The-Silver-Trilogy-2-by-Kerstin-Gier.pdf
    • http://muicuiu.dumb1.com/8a08a09a01a02/The-Ruby-Red-Trilogy-Boxed-Set-by-Kerstin-Gier.pdf
    • http://muicuiu.dumb1.com/4a03a05a01a07a01/Emerald-Green-Ruby-Red-Trilogy-3-by-Kerstin-Gier.pdf
    • http://muicuiu.dumb1.com/3a07a01a04a04/Emerald-Green-The-Ruby-Red-Trilogy-3-by-Kerstin-Gier.pdf
    • http://muicuiu.dumb1.com/5a05a06a09a04a09/Emerald-Green-by-Kerstin-Gier.pdf
    • http://muicuiu.dumb1.com/5a05a06a08a09a08/Ruby-Red-Ruby-Red-1-by-Kerstin-Gier.pdf
    • http://muicuiu.dumb1.com/3a05a07a03a08a04/Precious-Stone-High-Tide-Suspense-Book-4-by-Min-Edwards.pdf
    • http://muicuiu.dumb1.com/1a08a07a08a04a08/Sapphire-Ice-The-Jewel-Trilogy-1-by-Hallee-Bridgeman.pdf
    • http://muicuiu.dumb1.com/4a01a01a02a06/Precious-and-the-Monkeys-Precious-Ramotswe-s-Very-First-Cases-1-by-Alexander-McCall-Smith.pdf
    • http://muicuiu.dumb1.com/4a01a06a09a02a05/Sapphire-The-Sapphire-Series-Book-1-by-Snow-A-E-White.pdf
    • http://muicuiu.dumb1.com/1a08a08a04a07a06/The-Jewel-Series-Bundle-1-Sapphire-amp-Rubies-The-Jewel-Trilogy-1-1-5-by-Hallee-Bridgeman.pdf
    • http://muicuiu.dumb1.com/1a00a09a06a03a03a05/One-Crazy-Ride-Blue-Mustangs-MC-2-by-Emily-Stone.pdf
    • http://muicuiu.dumb1.com/5a05a09a09a07a05/Sky-Blue-Stone-The-Turquoise-Trade-in-World-History-by-Arash-Khazeni.pdf
    • http://muicuiu.dumb1.com/4a07a00a03a05a00/Heart-of-Stone-Trilogy-Box-Set-Heart-of-Stone-1-3-by-K-M-Scott.pdf
    • http://muicuiu.dumb1.com/4a05a04a05a08a09/Under-the-Same-Sun-Stone-Trilogy-2-by-Mariam-Kobras.pdf
    • http://muicuiu.dumb1.com/1a01a00a05a00a05a07/The-Imaginary-The-Imago-Trilogy-2-by-J-J-Stone.pdf
    • http://muicuiu.dumb1.com/1a01a00a04a07a09a06/The-Mirror-Stage-The-Imago-Trilogy-1-by-J-J-Stone.pdf
    • http://muicuiu.dumb1.com/1a08a07a08a04a08/Sapphire-Ice-The-J

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