Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afcbfa12cc8d1b5…

MALICIOUS

PDF

36.5 KB Created: 2021-05-22 06:08:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8aac2976ee6eeaecb7885aa19d460fca SHA-1: 44c22599cd17040088d39387a31cbe240bcf24af SHA-256: 5afcbfa12cc8d1b5a532c3708a6b0e9f858b0d826a2ed9005f896735693c0066
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to pages offering 'free Robux' or 'game hacks', a common lure for malicious downloads. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' confirms this, and the ML classifier also flagged the document as malicious. The presence of these lures suggests the document is intended to trick users into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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://netcdn.xyz/app/431946152/robux-hack-me-game-hack PDF link annotation
    • https://www.ferraroni.net/public/risorse/ck/files/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000318d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x318D 25400 bytes
SHA-256: 2cebd24b528653f503b297b8fef883a89f585d24192f0bcb58b74c8babf3a18e
font_01_sfnt_off00006cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD6 18444 bytes
SHA-256: 63c17dbc7d8c7d1de0ff2471750372836806f4a6a54ec4612fcacbe2caf81c31

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