Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a92b0c42755c803…

MALICIOUS

PDF

45.6 KB Created: 2021-06-09 14:37:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0c4863f7aaf2b3df22acf64db3682036 SHA-1: 083efc129b8453b945efa3cd143d79c9b9061dd8 SHA-256: 9a92b0c42755c8038bb98e90f137dc0c0a0aca31b93808354e8d1aea2fa54ff7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting "free generator / game hack" lures. The presence of multiple links to known malicious redirectors and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful content. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/hack-roblox-game-game-hack In PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/working-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-get-20210-robux-free_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/roblox-scam_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-get-free-minecraft-alts_GM479516143.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_off00005239.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5239 25948 bytes
SHA-256: b5b93a5cf8b1823c79cbdef4b60d0900269e7d46b5652179f3eb843c9998892b
font_01_sfnt_off00008f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F02 18440 bytes
SHA-256: 7a7f946f91573c229dea62ef09e09f1965e60b7b2b7eb0bba2c67bb36dd05c0d

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