Malicious PDF — malware analysis report

Static analysis result for SHA-256 c318829ff2f94793…

MALICIOUS

PDF

49.3 KB Created: 2021-06-08 11:52:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 06539bfc86402c3cee283f62bd20204a SHA-1: 27641c2f1d621f5f3f8e61e6ee8e74103231d55c SHA-256: c318829ff2f94793a7a1bdf27c361f4383217e1ada25768b96c47d529f17f634
142 Risk Score

Malware Insights

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

The PDF document uses a lure related to 'Roblox Hacks' and presents a fake CAPTCHA to trick users into clicking a malicious link. The embedded link directs to a URL associated with game hacks and generators, which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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
  • 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 https://netcdn.tw/app/431946152/roblox-hacks-case-clicker-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-gift-card-uk-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/rape-simulator_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C0 28112 bytes
SHA-256: 396c72297bcdfe1988df5a966361f0bbfc5400e8966d1dbdc246715d39c94f73
font_01_sfnt_off00009172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9172 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E19 18300 bytes
SHA-256: 94c8246c4239b2cbf826e00832cb7d74613300846718e34b9db9ea99f3e951d6

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