Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8b5b6bb389f42c…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 12:43:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1c479c37800b1d050e522d2733966432 SHA-1: a5c2fa1ce296fc946c6b08bcc7c37e62f4017ee6 SHA-256: 4b8b5b6bb389f42cc7fd84369d2ef5c5e58c00236242a0d2a7599e4cc738ff2f
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains an external URI pointing to a suspicious URL, and a machine learning classifier flagged it as malicious. The presence of embedded URLs and a visual download lure suggests an attempt to trick the user into navigating to a site that likely hosts malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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 https://netcdn.online/app/479516143/was-minecraft-ever-free-game-hack
    • https://ifef.es/ckfinder/userfiles/files/free-spins-for-coin-master-that-work_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-often-pubg-uc-appointments_GM1330123889.pdf
    • https://ifef.es/ckfinder/userfiles/files/como-hackear-coin-master-en-espaol_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/roblox-games-with-free-radio_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/giftrobux-com-generator_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/pubg-uc-generator-without-human-verification_GM1330123889.pdf
    • https://ifef.es/ckfinder/userfiles/files/wahoo-gaming-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/rbxoffer-com-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-do-you-get-free-food-in-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-real_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-coins-link_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-hack_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hacks-to-get-spins_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdf
    • https://ifef.es/ckfinder/userfiles/files/roblox-hack-me_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/20-free-spins-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-link-spin_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spin-and-coin_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005422.bin
aad47d141ea80f6ca060d69a3e8e78e2f78ec0ad6a044e5ae50d8596c566bfa4
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5422 24056 bytes
font_01_sfnt_off00008ac4.bin
fa9564ce5793f03604dae66ea4261aaef87f9e1e7420b634dd5196a1b51aa919
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC4 17880 bytes