Malicious PDF — malware analysis report

Static analysis result for SHA-256 831c9c7cb5909ae6…

MALICIOUS

PDF

20.7 KB Created: 2021-07-08 01:36:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3e4998b916e4a3e20c585abedde8fcb1 SHA-1: c435bfff989e31d0dd8a67841f4cfc4c0a509cdd SHA-256: 831c9c7cb5909ae65063e68d9d6e4bf6b64de948fcc01c2de6c8db7450846e09
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a lure for 'free spins' and 'game hacks' which redirects to a malicious URL. The primary heuristic indicates a PDF game hack redirector, and the document body confirms the lure. The embedded URL is the highest priority IOC, likely leading to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 3

  • 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.
  • 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/get-free-spins-coin-master-2021-game-hack PDF link annotation
    • http://www.donjastubica.hr/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-speed-boats-free_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/auto-clicker-download-roblox-bloxburg-free_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-vip-roblox_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/best-ways-to-make-robux-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/my-roblox-group-got-hacked_GM431946152.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000323c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x323C 11562 bytes
SHA-256: 54fd37688d076b3ef98255b4437a26b011d32599823e1fbfdde211306dbacd7f