Malicious PDF — malware analysis report

Static analysis result for SHA-256 18751a70bece7d7c…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 18:00:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b7a32e53e4d2ab4787456b9e75a0dc7b SHA-1: eba1924d412c8c1e541259ecec8e4d4ca27e4c90 SHA-256: 18751a70bece7d7ca622fb0bc32a7a503e35a56762fd04dc1de42d4f0827f0df
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple embedded URLs and a high-confidence heuristic firing indicating it links to a 'free generator / game hack' redirector. The document body text reinforces this lure by mentioning 'Free Robux Without Any Verification'. This suggests the primary goal is to trick users into visiting a malicious website, likely for credential harvesting or further malware delivery.

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/free-robux-without-any-verification-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hacking-into-a-online-account-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-no-human-verification-2021-ipad_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-how-to-cheat-on-tycoon-games_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hack-to-get-20210-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-flight-hack-download_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-robux-no-hack-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-pc-hack-download_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-on-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-hack-generator-xbox-one_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/cheat-roblox-lumber-tycoon-2-fly_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-gift-card-hack_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_off00002ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC9 22032 bytes
SHA-256: 5ef5dce4a911ef11ba4b9cc8d424061af58e47730193b41b757f7822a25023c6
font_01_sfnt_off00005fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA1 19620 bytes
SHA-256: 98e25ba6f0db8882549c0e371305563de57acb07d7fce2330b7496bf897a2717

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