Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59412b2511090ab…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 03:11:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 88c35cf55062d00342e2e645f1cf609c SHA-1: 9b197f48f603a6573aa4541fc291b6f0c4d064c0 SHA-256: c59412b2511090ab65b10543d2def9d470593f7261c4875305b583009b18b46f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a document body that explicitly advertises 'free redeem codes' and 'game hacks' for popular games. The primary URL, http://netcdn.tw/app/406889139/free-redeem-code-for-coin-master-game-hack, is flagged by heuristics as a lure for game hacks. While no scripts were extracted, the presence of numerous links to similar lure pages suggests a phishing or malware distribution campaign. The document's structure and content strongly indicate an attempt to trick users into visiting malicious sites.

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/free-redeem-code-for-coin-master-game-hack PDF link annotation
    • http://elibraryfk.unjani.ac.id/elibrary/repository/robux-hack-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-roblox-codes-june-2021_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/extreme-easy-free-robux_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/nitro-fun-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/roblox-free-draw-2-how-to-teleport_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/hacking-roblox-with-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/robux-free-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/hack-de-roblox-apk_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-halloween-costumes-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/what-percentage-do-roblox-robux-hacks-usually-go-to_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/roblox-how-to-hack-someones-account_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/hackaron-roblox-robux-hack_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
stream_002_off00003465.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3465 22812 bytes
SHA-256: 22dfcc9fda3df9e09429d4223b69e70982392eda1dc47ba41026bcca59510a74
font_01_sfnt_off000067ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AD 18432 bytes
SHA-256: c861c688303d0ce30a75b450dc2e1ce34b57c54574c870d49b8c2c1412c8bb94

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