Malicious PDF — malware analysis report

Static analysis result for SHA-256 618ad1e14eaf5a78…

MALICIOUS

PDF

36.1 KB Created: 2021-06-26 03:47:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 95af357731be3d6ff42f071494e8764f SHA-1: 6ee02b44f8524b0ef24422a33f30269b0c012303 SHA-256: 618ad1e14eaf5a783621832ea4c3aeb30a8073ad70e14e87b18fab9efaa7026d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.co/app/406889139/coin-master-mod-apk-unlimited-spin-download-free-full-version-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-hack-roblox-2021-september_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-cheat-roblox-jailbreak-2021_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/how-to-hack-dbfp-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/hack-apk-roblox-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-draw-2-roblox-save_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-any-gamepass-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/can-i-wear-clothes-i-make-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-do-i-hack-steam-to-get-free-robux_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_off0000341d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x341D 22600 bytes
SHA-256: 63ea9b9e076393e0549f452280bbca3a39208b716dadc14b6aeb043f0ddc819b
font_01_sfnt_off00006683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6683 19644 bytes
SHA-256: 93f2d3fa6be328934c38f819826887a058c13247078841697941bd7ee8192d3d

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