Malicious PDF — malware analysis report

Static analysis result for SHA-256 b387caee6ff1c7a1…

MALICIOUS

PDF

33.9 KB Created: 2021-06-27 01:22:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 71b529b4957f9d74394959dc794a8d32 SHA-1: d30b8ed31b12ffc6045cced66569f3d0546f33f2 SHA-256: b387caee6ff1c7a11e512113df2d288513f6c7a658b47836a11e1b87fdc5cabd
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links disguised as game hacks and free currency generators, with a primary link pointing to 'roblox-crosshair-hack-game-hack'. This lure, combined with the ML classifier's high confidence, indicates a malicious intent to redirect users to potentially harmful websites or download malware. No scripts were extracted, but the embedded URLs and the 'game hack redirector' heuristic strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-crosshair-hack-game-hack PDF link annotation
    • http://www.eucorro.com/arquivos/files/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-buy-things-in-game-for-free_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-free-robux-no-tix_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/hacks-para-tener-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/easy-working-ways-to-earn-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-setup-a-minecraft-server-for-free_GM479516143.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
font_00_sfnt_off00002dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DEC 22352 bytes
SHA-256: 238d4605d5cd7e2a9b5d4169856c180aa82916fb3b63d9cd39828ba630770faf
font_01_sfnt_off00005fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCA 18944 bytes
SHA-256: 6e5ca08586b2bf0c86e0964a1518edf0d8440514e1c71a7c43e3aec92cd4f323

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