Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f91c1bd28ec469…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 04:24:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dd52a5fc4a0d2c03040864f0ee7ce3b8 SHA-1: aae89ee4c61a9fcd4898adbb3a225ac945cbdb5f SHA-256: c2f91c1bd28ec4698c5b43d2db43a0d65a195a89eb2384faff8b6c86562ec9da
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, directing users to a malicious URL that promises game hacks. This suggests an attempt to trick users into visiting a potentially harmful site, likely for credential harvesting or further malware delivery. No scripts were extracted, but the embedded URLs and the fake CAPTCHA heuristic strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/oprewards-login-game-hack PDF link annotation
    • http://www.perpustakaan.unda.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/pubg-uc-30_GM1330123889.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-vehicle-tycoon-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/tower-of-hell-roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cm-free-spin-link-today_GM406889139.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_off00005289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5289 25388 bytes
SHA-256: 9152fb83dd301378d53e639abde072959ffd68b80ea143885f89fbac4847d5c0
font_01_sfnt_off00008b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B69 18492 bytes
SHA-256: 81eae8079694c842f573892a7bdeb7507755234d7d643456fdd469df9fa7c23d

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