Malicious PDF — malware analysis report

Static analysis result for SHA-256 1353249914dba6da…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 03:17:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 36ecc6d177d58cee503d89809220694f SHA-1: 809cb6c6c77fe35fb4c0baea3ec9e0488a0ecfb3 SHA-256: 1353249914dba6da69887db7a8fc444ec71f7d211fdb2479aad19f3760b504f6
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/431946152/free-robux-no-verify-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/get-free-robux-on-roblox-without-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/cheat-codes-for-assassin-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-account-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-for-tablet-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-skin-creator-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-cheat-in-roblox-royale-high_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-accounts-2021-january_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-2-step-verification-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-cocdes_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-can-i-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
font_00_sfnt_off00002ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC1 21776 bytes
SHA-256: 73774bdf270c74613ccecb803799969e4639306fe03e1aa259e05e2756000d2f
font_01_sfnt_off00005eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECA 19148 bytes
SHA-256: c82ca362f7929c521a15e373c099d5f63e765e94f5114feac3ee2b66231d0241

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