Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61d5c06d978c8f4…

MALICIOUS

PDF

44.7 KB Created: 2021-05-15 00:11:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: df64b41809726a9cdf6f0491454b6abe SHA-1: df05d49a68e8ffcb66fedd0c3505fced09601b24 SHA-256: e61d5c06d978c8f49c969f052ac10e732fe0a6cd253aca0c7f39c050b34bb2a6
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into interacting with embedded links, such as https://netcdn.xyz/app/431946152/robuxglobal.com-game-hack. This suggests an attempt to deliver a second-stage payload, likely through a drive-by download or by exploiting a vulnerability. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/robuxglobal.com-game-hack PDF link annotation
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/roblox-sexually_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/is-coin-master-hacks-safe_GM406889139.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_off00004c8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C8C 27468 bytes
SHA-256: 92418866a4268318f4bffb6c36faa70d5ecbd37c58432d74453e63d76b5f08ef
font_01_sfnt_off00008b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B21 18764 bytes
SHA-256: 59fb30c80e85498b2f7c5a4d05a5dec781d28c8684b6c7c45546c982bbf76575

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