Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdfb66cda2d186a…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 17:56:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d4a1cd404cb0daf5f8678c6d62208493 SHA-1: ab36eb2d1338951f2bc03eb383af24cf2867daf0 SHA-256: efdfb66cda2d186a548a8014906894ccf52415c784e8be697daa46d0e1c40e93
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for game hacks and free spins, directing users to a suspicious URL. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content, likely for credential harvesting or 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/need-free-spins-for-coin-master-game-hack PDF link annotation
    • https://fib.ub.ac.id/sac/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-rifle-script-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-the-best-cheat-engine-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-jailbreak-roblox-money_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-forsaken-sword-3-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-outfits-boys_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-for-apps_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-online-roblox-death-games_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/are-private-servers-in-roblox-free_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_off0000310f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310F 22700 bytes
SHA-256: d4443152e2d14a435a475f727e343913ce23db9ef7100c8838fa102337811541
font_01_sfnt_off000063e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E1 18348 bytes
SHA-256: 3957c128dc793e62d1304d4284793c4a4087ddceea17158896e7adcb416da0fe

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