Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9633eea0940971…

MALICIOUS

PDF

46.1 KB Created: 2021-06-11 03:14:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 87ec5b9e0361a9af3213cde3e603f172 SHA-1: 184b2a612efc76d5aecc1e38060856708b1d3dd8 SHA-256: ca9633eea0940971406fab43e95167ec84b6d9a608dee8772af98c5e97b59cea
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 0.9864

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-look-cool-for-free-in-roblox-game-hack PDF link annotation
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://www.esmartdigitalcard.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-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_004_off000053bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53BB 26796 bytes
SHA-256: 6f9291cd898af118f2d11c000f0fbaf8d734277301a515f4fa326f5212a2e435
font_01_sfnt_off000091c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91C6 18280 bytes
SHA-256: 08965375e32fbf5fb002ae66a0fb491a0afe3787ffd4f66dd1f2254d90a6c89b

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