Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98bfb61a4167e36…

MALICIOUS

PDF

44.4 KB Created: 2021-06-09 10:58:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 522f030dbc8fbcdc67d446183587a877 SHA-1: d2faa9174ad25de09c9cf3a845d990d650075e06 SHA-256: c98bfb61a4167e36075e82d9b158e436d10aa11e6a007ce6f52f3174e11eea5c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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/free-robux-and-tix-giver-2021-game-hack PDF link annotation
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-hacks-for-gold-cards_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/roblox-elemental-battlegrounds-hack_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/free-robux-update_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/robux-hack-no-human-verification_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_off000051d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D7 24380 bytes
SHA-256: c2321f9fd7b11a5129bf45455e8c5b7af9a352319e28037a48a348111f6371c2
font_01_sfnt_off0000893d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x893D 18824 bytes
SHA-256: 6d0f748bb9b7d88c782dc290b467ffd761e3ff9638546d2b2e9058d96606e248

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