Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4667bb9cdafb960…

MALICIOUS

PDF

45.6 KB Created: 2021-05-11 13:42:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7d749ff2cd3d230fdb4b138fb081a1c3 SHA-1: 8172f6f7737ec9e7e166be40a6b4275d348e4857 SHA-256: c4667bb9cdafb960a5179b22d51f67f97b5db2f5034971cb4e9c748676b4ea3e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites that promise game hacks and free currency, a common lure for phishing or malware distribution. The heuristic 'SE_FAKE_CAPTCHA' indicates the document likely presents a fake verification prompt to trick users into interacting further. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.
  • 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
  • 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.xyz/app/431946152/lots-of-robux-game-hack PDF link annotation
    • http://greasley.website/images/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/coin-master-app_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://greasley.website/images/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://greasley.website/images/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004736.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4736 25868 bytes
SHA-256: b069d4532d0484f474f75a3523555eeeca28411d54a71d4f97574eacc21790ed
font_01_sfnt_off00008353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8353 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9064 17952 bytes
SHA-256: 15d841c4e586d0ad4ef984c3fe87cdc5c0f17f998b76c5925d27cfadcec23376

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