Malicious PDF — malware analysis report

Static analysis result for SHA-256 79987534d52a499e…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 04:12:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 06e91e83fd5b6524c570cec5d812461f SHA-1: 588476f0aeeffef4b5aa079fe129173cca670f67 SHA-256: 79987534d52a499eafdd72073efb4bc1e50ce34642d20239b986a34027f56a66
90 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to a URL advertising a game hack, indicating a lure to download malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure reinforces the malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/roblox-apocalypse-rising-hack-tool-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-usa-2021_GM406889139.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_004_off00005415.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5415 25008 bytes
SHA-256: 7ff770b38c9a681d85ded9cf930fb937972a2c7aa0bef401c136cd26133d728c
font_01_sfnt_off00008e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E58 18948 bytes
SHA-256: 36103d21293c125a468310e94ae81f3f38f971fdc88e4fd3b3bae89cd0caca47

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