Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b730c0176c90d50…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 12:42:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c5d592af77e97d6923bb5bdd53bb945a SHA-1: 308ec7244d34026330dae053afde64c380e91e38 SHA-256: 3b730c0176c90d50e8bf616ba98055023b422e1fa23a7c6d2053ff959e8bc3e7
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/431946152/how-to-get-free-quirks-in-boku-no-roblox-game-hack PDF link annotation
    • http://library.gkigadingserpong.org/repository/robux-infinity-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/when-tiktok-free-download_GM835599320.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-obc-robux-inspect-element_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/cheat-roblox-storm-beyond_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-emergency-response-cheats_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-back-your-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-works-no-survey_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-accounts-forums_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-premium-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-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
font_00_sfnt_off000031d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D0 22360 bytes
SHA-256: f13c830f2fa2992858cbf65a31c4df8377a1bb96bd65f0027a4a1bed4cb96838
font_01_sfnt_off000063b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B9 19320 bytes
SHA-256: 946eb5eef23aa511f920beeeb88d5eea0f21238fe368c3a8c0234937c8e3aece

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