Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71cb3a38f2b5de8…

MALICIOUS

PDF

44.8 KB Created: 2021-06-04 00:43:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 396aaac0889da549a9d4c7180921bfdc SHA-1: 8cd20516fc0b08d58e0adb14aa5ab1380f69e4c7 SHA-256: b71cb3a38f2b5de84e72aee5584ff23e3c00f4636d6cf46b859e7fb5afa0cb53
122 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic firing for a 'free generator / game hack' lure, directing users to a suspicious URL. Additionally, a fake CAPTCHA heuristic suggests an attempt to trick the user into executing further actions. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a phishing or social engineering attempt to redirect users to malicious content.

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/free-roblox-avatar-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-easy-and-no-ganerators_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-mod-menu_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/rbx-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/blox-pink-robux-free_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
stream_004_off0000509c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509C 25660 bytes
SHA-256: dc9c60dd5c405d7e44565bf1d60d419868fb6426b9b2b431953da8d6487dcd4f
font_01_sfnt_off00008c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3A 18396 bytes
SHA-256: ea9b66db0b849f47a5cfa8545e574f06832df8c426d4970ca3b5809346365e53

Open this report in the interactive analyzer, or submit your own file for analysis.