Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d911480a9c19f2…

MALICIOUS

PDF

44.8 KB Created: 2021-06-04 02:51:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f47d5b7403fff753d51df1c3f788a071 SHA-1: 329052ef93ec5a424b4038cc9031e51c2652d4a1 SHA-256: 37d911480a9c19f2b417866f0f90099322dca4e17eeb1b147bc5e11f11295c0e
122 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' and displays a fake CAPTCHA to trick the user into clicking a malicious link. This link, 'https://netcdn.online/app/431946152/free-roblox-codes-2021-game-hack', likely leads to a further stage of infection or phishing. The document's structure and embedded URLs suggest a common social engineering tactic to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/free-roblox-codes-2021-game-hack PDF link annotation
    • http://library.gkigadingserpong.org/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-coins-on-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-tiktok-followers-without-verification_GM835599320.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_off000050b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50B0 26244 bytes
SHA-256: 59d3c4de2e290574a04b072eed396b4deaef778c6ee5f4f4c6eede52447e3ebf
font_01_sfnt_off00008b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B73 18524 bytes
SHA-256: 2cb7cffe6898b24bffb42f458692356b56cf8186bc9d806687ffddb45d527cfe

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