Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a55a1b3d280e01d…

MALICIOUS

PDF

35.5 KB Created: 2021-07-06 10:07:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c27b04278362aa5ceff92239c7157515 SHA-1: 59ee8ec9b888f0380ed835173cb29e3cd80b0ed0 SHA-256: 1a55a1b3d280e01db8f8105fc22c21c7a537c24c8af7e0f26cce6513cb86de7a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links and a lure for a 'game hack', directing users to potentially malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs indicates an attempt to redirect the user to a compromised or malicious resource. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interest in game cheats to lead them to a malicious download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-xyz-2021-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-obc-codes-roblox-unused_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-2021-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-assassin-hacks_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/escript-executer-roblox-free-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-roblox-exploit-no-crash_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
font_00_sfnt_off000031d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D3 23328 bytes
SHA-256: 3687f5694a1589bcb94f3be8113cf7ab111a1c863d4c947f783dd3ca121e6c86
font_01_sfnt_off000065d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D7 18896 bytes
SHA-256: 6196b08645be86931896c29a7b8527461e4ee1bb55985642a652b484aa03a2ea

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