Malicious PDF — malware analysis report

Static analysis result for SHA-256 49de93407cc611a1…

MALICIOUS

PDF

48.6 KB Created: 2021-06-03 06:07:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0494fc6f317e5dba8a2693ab9da59edf SHA-1: 7832436cbf724c157ae5bba75d0dadf1237cdaf3 SHA-256: 49de93407cc611a126b7f46192641ed543ae08269334e67bbcaa2b69a0e3ea41
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document impersonates Amazon and uses a lure related to hacking Roblox accounts, directing users to a malicious URL. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the document's content suggest a credential phishing or malware distribution attempt, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/how-do-you-hack-roblox-accounts-2021-game-hack.
  • 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.online/app/431946152/how-do-you-hack-roblox-accounts-2021-game-hack PDF link annotation
    • https://lib.stie-yai.ac.id/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ebf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EBF 25888 bytes
SHA-256: 947d5b5a67d6c87710025908da6757c544725bdf9e193acde10fd650463d3fcd
font_01_sfnt_off00008b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B25 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000097cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97CC 19324 bytes
SHA-256: 11e4c06e7c7f32a176127faf571fd781746c414e64b274d22934cf598431a944

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