Malicious PDF — malware analysis report

Static analysis result for SHA-256 68646d59bcaac42a…

MALICIOUS

PDF

48.8 KB Created: 2021-06-04 02:02:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a1cdeb6b0d820433bbc2dea7cc0d7e44 SHA-1: 877733e4b9b5545952f3c8d51459b8a7cf38789e SHA-256: 68646d59bcaac42ac834e4afd1fb78824127ed804e95c84480aea09f6be8a332
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free Robux generator' which redirects to a malicious URL. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a potentially malicious site, likely for credential harvesting or malware delivery. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/how-to-get-free-robux-no-human-verification-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/robux-come_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/tiktok-free-generator_GM835599320.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C3 25944 bytes
SHA-256: 7f999fa011381173461a5af1bce4e4a84f44139ac29627a4e6d324dcbee13f10
font_01_sfnt_off00008c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C95 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000099a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99A7 19024 bytes
SHA-256: add4238412854312c544fb77f8d10d54d15c3f72dfb550af23f9090805c2c756

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