Malicious PDF — malware analysis report

Static analysis result for SHA-256 288287fac73ad0ec…

MALICIOUS

PDF

48.5 KB Created: 2021-06-08 08:52:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 79d2c555a3a91c74f6c9a29696a526fb SHA-1: b4faf871ed79fa4b2a5388639be73ea8107d56a3 SHA-256: 288287fac73ad0ec0e1a60d22b27d76107e571476727ebd42d7fe577624c51ae
122 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with a malicious link. This link, 'https://netcdn.tw/app/431946152/roblox-free-wings-in-catalog-game-hack', redirects to a site promising game hacks. The document's structure and embedded URLs suggest it is part of a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/roblox-free-wings-in-catalog-game-hack PDF link annotation
    • http://library.atim.ac.id/repository/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/pokemon-go-joystick-ios-2021-free_GM1094591345.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50F1 25848 bytes
SHA-256: dd1f3106b13e4ca60ebf39a7e86cd8b8ba0625b41211e792cf23de67ce230b44
font_01_sfnt_off00008c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4B 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000098f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F2 18888 bytes
SHA-256: e78d40a2e90dced8d214c5c368f71f5ed8b10f9849c52d41e1cce37169bfd151

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