Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdae1bb077fffba…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 10:02:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f33e3037c65f58442c6cce832b4e4323 SHA-1: eba375aca4a1b9508de57c33c58bfed53fb253bb SHA-256: 7fdae1bb077fffbad7e4a60968791946bac7b8c0a36f25d893c3a94ce4de133a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic firing for linking to a 'free generator / game hack' redirector, specifically http://netcdn.tw/app/406889139/coin-master-free-soins-game-hack. The document body also contains this URL and other similar lures for game hacks. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a social engineering attack to redirect users to potentially malicious content.

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-free-soins-game-hack PDF link annotation
    • https://fib.ub.ac.id/sac//repository/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-martial-arts-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/final-stand-2-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-dominus-roblox-event_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/pubg-uc-olx_GM1330123889.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-come_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-android-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-surf-hack-script_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/dungeon-quest-roblox-item-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-earn-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-become-a-speed-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-rare-hats-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/pubg-uc-xtrcom_GM1330123889.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_off0000326e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x326E 23472 bytes
SHA-256: b18343ecbc6a8bc78d13c2d13ad053c18692b9f1b62a5ca78fc0c901ab1062f6
font_01_sfnt_off0000678a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x678A 17996 bytes
SHA-256: f4306de497449c0c0250de5deec7b8066a87c54091f9de3abe5accc399ec3ddb

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