Malicious PDF — malware analysis report

Static analysis result for SHA-256 73395239f4350620…

MALICIOUS

PDF

37.5 KB Created: 2021-04-18 14:14:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0b0cfeea1881963a6248cd3761668481 SHA-1: 3fc5761a984c7aa425fed912c48482cd87711f63 SHA-256: 73395239f435062048870ffb8eb30c87813c46a9fab642af684245768ab0c7a8
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a prominent link and text related to 'Breaking Free Roblox Piano' and a 'ROBLOX GENERATOR v' lure, directing users to a website that likely hosts malicious content. The heuristic firings confirm this is a game hack redirect lure, indicating an attempt to trick users into visiting a potentially harmful site. The document's authoring application, wkhtmltopdf, is not inherently malicious but can be used to generate PDFs from web content, which in this case appears to be a lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://gaminggenerator.org/app/431946152/breaking-free-roblox-piano-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000037cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37CF 25448 bytes
SHA-256: 45fa677a76de7004f1ccb2a9fb9e7e00f81781c513d8475a23a54d8f89ad7800
font_01_sfnt_off0000714a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x714A 18304 bytes
SHA-256: 376f41d9886c671b65e02e64c05eaaf0b407d1a471e379ec2db93c86048990a9

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