Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c383f26727db58…

MALICIOUS

PDF

46.6 KB Created: 2021-05-13 07:44:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 79dd0d6615358207105a4ae6458212b3 SHA-1: aeb3e66163ddf8cae2847271aa1b4c18d2d08f72 SHA-256: 27c383f26727db5836f4dc276f34addbe2a8c946a2bf68c5da9e876ebba83c3f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a fake CAPTCHA lure to deceive users into interacting with malicious links, specifically targeting those seeking game hacks or free spins. The embedded URLs redirect to sites that likely host further malicious content or facilitate phishing. No scripts were extracted, but the PDF structure and heuristics indicate a social engineering attack designed to lead users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/406889139/coin-master-free-spins-link-today-twitter-game-hack PDF link annotation
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.kpu-gianyarkab.go.id/new/public/ckfinder/userfiles/files/free-robux-mod_GM431946152.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_003_off00004c96.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C96 26140 bytes
SHA-256: 2047cd0ab75da27af5e3bb586a4aca5364e8ce22d9a137d2a9e074a8f1e0bc94
font_01_sfnt_off000088c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C5 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000092af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92AF 18572 bytes
SHA-256: 0871f56d6391a8b70b8bf0822360b4899fdb6849640762771593082ddaefd0d3

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