Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb9e094ef150996…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 08:12:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 99bfe28571335b1acb5d1255b70752f1 SHA-1: b0ead5a67e2a0d96a336fa560969375d8b8c2cda SHA-256: efb9e094ef1509965531d15362f38212006e9d64e59a798b08d924cdba956676
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a high-risk heuristic firing for linking to a game hack redirector, specifically targeting 'Coin Master' and 'Roblox' related cheats. The embedded URL, http://netcdn.tw/app/406889139/coin-master-collect-today-free-spin-game-hack, is the primary indicator of this lure. While no scripts were explicitly extracted, the nature of the lure and the ML classification suggest it's designed to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

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-collect-today-free-spin-game-hack PDF link annotation
    • http://library.feb.unila.ac.id/rfeb/repository/filtered-roblox-hacking_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/tiktok-followers-free-2021_GM835599320.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/pain-exist-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-rocitizens-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-gift-card-codes-free-unused_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-accounts-for-free-with-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/urbx-club-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/cheats-for-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/pokemon-go-free-7-day-streak-rewards_GM1094591345.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-play-free-without-downloading_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_002_off000032be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32BE 22904 bytes
SHA-256: d53128f0d888004b347fc347a980cd2406f296137123f21f50f67adb4ff47487
font_01_sfnt_off00006614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6614 18600 bytes
SHA-256: 9f0141af832a94a821a5611f1bf941e89b92ae493e4bc114a7de50135be697a7

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