Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88c2fb70fab224c…

MALICIOUS

PDF

44.5 KB Created: 2021-06-11 11:58:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 783858b8d41e50d06b19b4b5c9a2bb99 SHA-1: 77fcdbcbdd4de7247e05bc0ebd6f31639a7acfd8 SHA-256: c88c2fb70fab224c7d3ee0bfe6f19d1d330577dbd54e84f3c53c719dbc66d70f
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 0.9865

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 https://netcdn.tw/app/431946152/how-to-use-inspect-element-to-hack-roblox-game-hack PDF link annotation
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/free-roblox-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/free-minecraft-packs_GM479516143.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://seltechutamamandiri.com/ckfinder/userfiles/files/free-robux-co_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_004_off0000521d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521D 23980 bytes
SHA-256: 4faa98fd26a4d1ee03f0b50d877dcd9ca22cc45234c8336c528b892c5b8c3ecd
font_01_sfnt_off000088be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 19072 bytes
SHA-256: b688883b247485f2f0cee7047270597b8dd6fddc188720052ef9e0ed9d4e5d33

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