Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59bb5e9650b0d40…

MALICIOUS

PDF

35.0 KB Created: 2021-07-07 16:21:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 736ec10a6b5fc6529778c87ff4b5a9bb SHA-1: 7ba55123f7e3210622833fcb24a7ece9b66f2204 SHA-256: d59bb5e9650b0d40689692d989ea4990011624cf76e8d00a1d69af40012bb32c
82 Risk Score

Malware Insights

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

The PDF document contains a lure for free game currency, specifically 'Robux', directing users to a URL that is flagged as a redirector. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit user interest in game hacks to lead them to potentially malicious sites or downloads.

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.tw/app/431946152/how-do-you-get-free-robux-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/mining-simulator-hack-roblox-anfr_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-bc-on-roblox-mobile_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-code-genorator_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/pubg-uc-4all-cool_GM1330123889.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-codes-november-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-giftcards-pin-on-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-become-a-speed-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/clicker-games-in-roblox-free-admin_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-cheat-engine-noclip-script_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-scp-containment-breach-hack_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-earn_GM431946152.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_off000030a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A5 22516 bytes
SHA-256: 3475223744c6bb5cbbd724e8451bb1e9637ef272a1e5d8cfabbc8ccd8befc75d
font_01_sfnt_off000062fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FE 19316 bytes
SHA-256: 99209f55b8a3eadb57fc79f11dd938dc70b993b67b3cdd4e22b37a6312af6b20

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