Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eba1a0effd770c…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 16:14:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c66c70e16641c4df8f2e35e7543392a8 SHA-1: a7ceebf5c3aa7df0dd8d8a92be7a207af9d03069 SHA-256: 88eba1a0effd770c935acc347d026328cd1d380f2f9caeab09733988fe62101f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of 'free Robux' and game hacks to entice users. It contains multiple links to external websites, including http://netcdn.tw/app/431946152/how-to-get-free-robux-no-survey-game-hack, which likely serve as landing pages for scams or further malware distribution. The ML classifier strongly indicated maliciousness, and the presence of game hack lures aligns with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.tw/app/431946152/how-to-get-free-robux-no-survey-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/cmds-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/sonic-boom-shirt-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-cheat-robux-fr_GM431946152.pdfIn macro / runtime command snippet
    • http://www.elibrary.perludem.org/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-glitch-2021-pc_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-into-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/como-tener-hacker-en-el-hospital-de-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-walk-through-walls-in-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-robux-robux-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hacks-for-boku-no-legacy-alpha-2x-exp-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/secure-payment-with-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-studio-ship-parts_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-a-piano-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.orIn macro / runtime command snippet
    • 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_off0000319d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x319D 21828 bytes
SHA-256: 5530b92631e77946712c2b48bbcd3575124c0ec09821310f8e3d88a7eea484a7
font_01_sfnt_off000061e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E9 19280 bytes
SHA-256: 051b1285d740c577603dabb5231f5e4d954de3c0b025fd39f0418c252076454f

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