Malicious PDF — malware analysis report

Static analysis result for SHA-256 81935896dabd3b40…

MALICIOUS

PDF

43.3 KB Created: 2021-06-04 04:01:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cbdcdb684af51fce1dc2ea165ccd5490 SHA-1: f23c975a249ca5787691d78cdd18d3f057c7a860 SHA-256: 81935896dabd3b404b52241548e12dd5575d5b1e00541e103a56fdbf683d41fd
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.online/app/406889139/free-spins-coin-master-without-survey-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id//repository/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-no-gift-card_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_off00004e66.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E66 24260 bytes
SHA-256: 855e7dc1c8367ef5a0577fb2e8cc0807ed7521fed8266914f43cea988e223577
font_01_sfnt_off00008570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8570 18684 bytes
SHA-256: ad7fa04790fc34b76c8e1b16c403c61c32ceaee032d5a8afb0071baf0a254118

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