Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d51f44a97c4c11d…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 08:21:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e188d13093a2f0dfaba01e8dbe75155e SHA-1: a49fd16149e8000735a6843e4ac89d5757fd07b5 SHA-256: 3d51f44a97c4c11d14a22afbea781cefcddd5267bd4c9f9d6075a724a15b6cda
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free Robux and game hacks, directing users to the URL http://netcdn.tw/app/431946152/free-robux-2021-game-hack. This heuristic firing, combined with the ML classifier's high confidence, indicates a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the presence of embedded URLs and the lure strongly suggest a phishing or malware distribution attempt.

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/431946152/free-robux-2021-game-hack PDF link annotation
    • https://vireco.store/ckfinder/userfiles/files/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-free-robux-in-roblox-any-device_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/roblox-noclip-hack-download-2021_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/alone-roblox-how-to-get-free-cash_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/roblox-bird-hack_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/hacking-forums-roblox_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/buy-free-robux-roblox_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/roblox-free-draw-2-script_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3025 21336 bytes
SHA-256: 8f164584a2e44bb8003aee5a01a3cbf997f2870798ebdfb8ed42e3b0ee880e49
font_01_sfnt_off00005e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 19116 bytes
SHA-256: bd102244ffb40c6add567cd3640126a26b927334c4b0bdc73f6a542841550b4a

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