Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5336abb71b5f228…

MALICIOUS

PDF

42.8 KB Created: 2021-05-19 21:15:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b3c676b1029fcd88d3759a51146dd541 SHA-1: 2c0b922d417cc446aece63f94b378cb8a4605592 SHA-256: c5336abb71b5f228ae73d7edb7299e92a57340ce4b00368f6ae3c765fc317452
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 0.9971

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.xyz/app/406889139/working-coin-master-hack-2021-game-hack PDF link annotation
    • https://sitam.co.in/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://sitam.co.in/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • https://sitam.co.in/images/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/www-roblox-com-robux_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/how-to-actually-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_003_off000049cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49CF 25824 bytes
SHA-256: af7b1cca2905224c6814c24de26b147771f92362595861da531cf1a74784b528
font_01_sfnt_off000083d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D9 18604 bytes
SHA-256: 744d1e6e570083d44e7505cde547d0f6819516289f88227fe4d6f00d173cb084

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