Malicious PDF — malware analysis report

Static analysis result for SHA-256 537e335e29a73fd7…

MALICIOUS

PDF

34.1 KB Created: 2021-07-09 21:53:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 962cabc591f3f46ebc9786ce49694f35 SHA-1: 77a6f2a9c6950ec163622a1bfdab273ac2ea57e2 SHA-256: 537e335e29a73fd76ab24cce74e86fbe3e9087c7bb0aa0fc368c4f8188e60a30
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'free game hacks' to entice users to click on embedded links. The primary link, http://netcdn.tw/app/431946152/how-to-buy-robux-for-free-game-hack, is a known redirector for potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful websites, likely for further exploitation or phishing.

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/431946152/how-to-buy-robux-for-free-game-hack PDF link annotation
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/hack-para-dar-dinero-a-la-gente-roblox_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/how-to-hack-robux-2021-may_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/how-people-hack-roblox_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/roblox-club-free-robux_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/free-cosmetic-items-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/rewards-robux_GM431946152.pdfIn PDF document text
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/free-spins-coin-master-ios-2021_GM406889139.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_off00003109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3109 21524 bytes
SHA-256: 322270b7b832bc3541dc8eff9187feb81ba7e29f9c43ec205fb20b91a883c781
font_01_sfnt_off00006020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6020 19060 bytes
SHA-256: ef5b7f60cf1fa637b1bfb552d40134022e1bfb8af4691738e10ad17902957aec

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