Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9761fdd92dea6ff…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 13:16:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9ca81b900da4ef38523382cfcc5a43e0 SHA-1: 8f5a0d962f34be1ab2f63dc401569f745ceaf691 SHA-256: a9761fdd92dea6ffe5c663552e730d85874fa7ad64af49732bcc86a7c817fdbd
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 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/406889139/coinmaster-rewards-game-hack PDF link annotation
    • https://perpustakaan.itda.ac.id/repository/how-to-hack-someones-roblox-account-for-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-hacked-told-my-account_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-roblox-admin-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-promocodes-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/raviz-cheating-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/funny-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/earn-free-robux-by-just-not-paying_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/can-u-get-roblox-on-ps4-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-robux-gratis-sin-hacks_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/live-free-roblox-card_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-script-hack-on-roblox_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
font_00_sfnt_off00003163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3163 22824 bytes
SHA-256: 31ce296e16e5afd558d08fdb89cc9bca6e12521e79ed9cb39034f1ca68f89aa0
font_01_sfnt_off0000648c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x648C 18432 bytes
SHA-256: f0edaf16bd8009573fa92d89786fb946d4f76dac2501643f884d8babe9c34ef0

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