Malicious PDF — malware analysis report

Static analysis result for SHA-256 f735b40b239f6689…

MALICIOUS

PDF

48.0 KB Created: 2021-06-11 09:49:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 826e833f4d7928e708e8f76f5799f573 SHA-1: 89396792087e481ef1abb78ed4c704a04e0b8007 SHA-256: f735b40b239f66897553bc1a627e521d4924993950b1b0ef113a8f5cdf47a511
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and 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 0.9871

Heuristics 6

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/how-to-get-free-robux-on-tablet-2021-game-hack.
  • 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-on-tablet-2021-game-hack PDF link annotation
    • http://digilib.stimata.ac.id/repository/faces-on-roblox-that-cost-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/games-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/wurst-18_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/hack-shark-bite-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-roblox-free-clothes_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-epic-face-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/good-avator-free-20-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/i-want-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/robux-hack-html-script_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
font_00_sfnt_off0000529b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x529B 29848 bytes
SHA-256: 8085dab6fb293fcb2c3ca28f2bde203ddab0ca39391227695b4078239c734760
font_01_sfnt_off00009705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9705 18988 bytes
SHA-256: 01c922a5f6bc440278eecadc2e4e29245016a2d7b90b714d85374ce526f712c0

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