Malicious PDF — malware analysis report

Static analysis result for SHA-256 e873eb5ad40b07b9…

MALICIOUS

PDF

44.7 KB Created: 2021-06-08 18:47:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 25f9a938afdf58b56a27f5634beb7920 SHA-1: c5352063bf6b5891f54db678a170a90119c23bd8 SHA-256: e873eb5ad40b07b9c736556879c657a3047c985527f7cbb238e06df2ae611a5e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9865

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.tw/app/431946152/how-to-get-free-robux-buy-obby-link-in-description-game-hack PDF link annotation
    • http://www.elibrary.fl.unud.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-account-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-tiktok-followers-no-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/download-coin-master-hack-tool-v1-9_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_off0000506d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x506D 25140 bytes
SHA-256: 193ef6f219485b3b541f56f4f02ee326bc09422b6b220c67f289fa54f570be88
font_01_sfnt_off000089c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C8 19096 bytes
SHA-256: 3db2e35b4b572eabc6892251673535cec1c964c90ee45f642f5b561a772b7414

Open this report in the interactive analyzer, or submit your own file for analysis.