Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2a682e15730e8c…

MALICIOUS

PDF

45.1 KB Created: 2021-06-04 00:13:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2b0e9ed320b719f5a2b8885ad9ff404a SHA-1: 542e309d607a7b309f1bdbdd64f33046c58bb6b1 SHA-256: 7d2a682e15730e8c94b8649dfa4449d97627d3ed464b26886b1cfb0c8cf256eb
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure related to 'free Robux' and impersonates Facebook to trick users into clicking a malicious link. The link leads to a site that likely serves as a redirector for credential phishing or malware distribution. The presence of a fake CAPTCHA prompt further supports the malicious intent to deceive the user into executing further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 7

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.online/app/431946152/how-to-actually-get-free-robux-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.online/app/431946152/how-to-actually-get-free-robux-game-hack PDF link annotation
    • http://library.asih-husada.ac.id/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/tiktok-free-folowers-4tiktok-site_GM835599320.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-epic-minigames-hack_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-gen_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_004_off0000502a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x502A 25704 bytes
SHA-256: bba7c24b66423d3982ca20b08c0b3de5d9cd1975196fe716070148e71eb83b0b
font_01_sfnt_off00008c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C30 18764 bytes
SHA-256: 380379838da7ba69723634981f8e24f026256aff947d3d13a6d99450b2ab0cc3

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