Malicious PDF — malware analysis report

Static analysis result for SHA-256 a835209ea35939db…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 17:32:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 96e63d9a44dbf22f410158c622902234 SHA-1: a82fc899d5dfded6055192bd6bd2d332e9bf3222 SHA-256: a835209ea35939dbbf5d3defc305909a16947c7d7e74eab0407c85c4dbbbd595
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on limebug.com and appear to be part of a link farm designed to attract users searching for game cheats or hacks. The primary lure is related to 'Roblox' and 'Coin Master' game exploits. The document's structure and the high number of outbound links suggest a malicious intent to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/how-to-make-hacking-scripts-in-roblox-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/tiktok-free-folowers-joker_GM835599320.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-free-login_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-apk-hack-android_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/blox-rewards_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/robuxhub-net_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-ios-gods-hack_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_off0000503a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x503A 24928 bytes
SHA-256: 7047e74ea5fcf90115386e9b394013ec748a21dbb86b60d39f8077bad9199bbb
font_01_sfnt_off00008a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1F 19232 bytes
SHA-256: 3df6c329b73ddf3bb0c9897d3f7dd7fe08a068764487f60cf4328582edc21510

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