Malicious PDF — malware analysis report

Static analysis result for SHA-256 776f7a754199fe08…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 22:48:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3a694541651a4b39591f18ea32f63670 SHA-1: 5dab9fb4da71837462d71607ff610aa991aa3d09 SHA-256: 776f7a754199fe08e2fa8e0ffda501f3164d963ceff57a70d7b5e2525f445fdb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and lures users with promises of game hacks and free currency, such as Robux. The primary URL, http://netcdn.tw/app/431946152/robux-websites-that-work-game-hack, is flagged as a redirector for game hacks. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or scam attempt to redirect users to malicious sites. The ML classifier strongly indicated maliciousness.

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.tw/app/431946152/robux-websites-that-work-game-hack PDF link annotation
    • https://pustaka.staiyastispadang.ac.id/repository/earn-robux-now_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/wix-site-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/roblox-robux-hack-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/free-real-robux-generator_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/roblox-money-hack-bloxburg_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/hurt-roblox-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/how-to-get-20210-robux-on-roblox-no-hacks_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/how-to-get-200-robux-free_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/woman-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/how-to-get-robux-on-roblox_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_off00002ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE3 22464 bytes
SHA-256: 6efdceebd8a3a8be516ed52a7b6e687d47ae5261bdffebe5a8cbc24ad5369a85
font_01_sfnt_off0000611f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611F 19312 bytes
SHA-256: 73868ece1fe81293537419ada8447d829975fd4ceb20fe177332fa15bbf8b41b

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