Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bec86f35c0a8fbb…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 05:36:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 63e7059f90360fcd25dfd578c8f9683f SHA-1: 8ae20eb864fad11e74330c6ad510872392fe6534 SHA-256: 4bec86f35c0a8fbb27dca3c6a67430494fa100612b4adf2536a4b68b2151ee2b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/406889139/coin-master-fb-free-spins-link-game-hack PDF link annotation
    • http://library.gkigadingserpong.org/repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/games-that-give-you-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-cheat-on-roblox-murder_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/chara-undertale-for-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-ha-sido-hackeado-por-jhon-doe_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-exclusive-virtual-item-codes-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-do-you-get-free-robux-on-phone_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
stream_002_off0000302c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x302C 22688 bytes
SHA-256: 2a50833515e59ff4fbbe7bdcec6e37d15cd38af1f0baac8618fdbb5add220a98
font_01_sfnt_off000062cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CD 18504 bytes
SHA-256: 6fae6f2ed4f6bec01b64d1670d3a971b1a45bf61d7518176b6a7fdaf35e32234

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