Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d81bf547eb491cc…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 12:56:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5c10574dcfcdff4663efecc8ba96fa31 SHA-1: d049ac746bc991006c0c1ae635f2e94a95680ad9 SHA-256: 4d81bf547eb491ccfa864ddc6b026f42c1b1ad9d7e9e8e93264a2025c83afedb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a high-confidence heuristic firing indicating it's a lure for game hacks. The document body, though partially garbled, contains references to 'Coin Master' and a URL that strongly suggests a phishing or scam attempt. The presence of embedded URLs and the nature of the lure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/best-site-for-free-coin-master-game-hack PDF link annotation
    • http://perpus.i2s-learning.com/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/infinite-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-level-3_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/spin-hack-for-coin-master_GM406889139.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_004_off00005234.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5234 26552 bytes
SHA-256: db4485b84a505514a6542e20671f7e1d7c1e51864f06d5ece73937bf1605fe3d
font_01_sfnt_off00008f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1D 17924 bytes
SHA-256: 54ba583de7ef6a44d3440287f67bc1236d632228fc17eebf6d790bd3337eaafd

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