Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f903f8f5e0d321…

MALICIOUS

PDF

33.8 KB Created: 2021-06-18 23:36:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 85da447a0b13dbb78cba7ac10bd3abe2 SHA-1: 2382dc58d514d3fa4e26d91c56235d3006d33e26 SHA-256: 53f903f8f5e0d321707febd3c28c43df1d81b58cb9cd4bb0a20bdeb4463df26c
102 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 callback-phone (TOAD) 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 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.co/app/431946152/free-robux-card-pins-game-hack PDF link annotation
    • http://vibrato.fr/images/robux-prices_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://vibrato.fr/images/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://vibrato.fr/images/free-tiktok-app_GM835599320.pdfIn PDF document text
    • http://vibrato.fr/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://vibrato.fr/images/free-robux-master_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://vibrato.fr/images/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://vibrato.fr/images/roblox-robux-hack-no-password_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/roblox-sex-hack-download_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/cm-spins_GM406889139.pdfIn PDF document text
    • http://vibrato.fr/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://vibrato.fr/images/robux-games_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/free-tiktok-fans-without-verification_GM835599320.pdfIn PDF document text
    • http://vibrato.fr/images/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://vibrato.fr/images/how-to-hack-roblox-accounts-using-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/free-robux-on-phone_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_off00002da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA6 22368 bytes
SHA-256: dc71ff403ac92697e610b947a464365009ce82ed8ca41f8efdca7b56b3b34c69
font_01_sfnt_off00005f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6A 18980 bytes
SHA-256: 405537e3963eba63c371c4bbcd1d6aad1c07c07682e74fe903038cc1bca13759

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