Malicious PDF — malware analysis report

Static analysis result for SHA-256 c556df9f6deb3a3f…

MALICIOUS

PDF

45.8 KB Created: 2021-06-04 02:34:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ad003a04628a4dda97c8f58f16a5d65a SHA-1: c8af71de8fed675f2be72e4cc27c54e9ad88c64c SHA-256: c556df9f6deb3a3f418dbcd4b21adad81e2023faea4dfd76c98f33ef5a76e32e
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA or human verification prompt to trick the user into interacting with it. It contains an embedded URI pointing to a suspicious URL, likely intended to download a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/roblox-2021-game-hack PDF link annotation
    • http://slims.abulyatama.ac.id//repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/blox-rewards_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/pokemon-go-free-to-play_GM1094591345.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_off000052f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F8 27112 bytes
SHA-256: 9b646d2e9633aaa02251048647f8fbf7b5c50510b8ac1893290310d99f27bd0d
font_01_sfnt_off000090c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C9 18184 bytes
SHA-256: 6cca9372861d076cf8d3c2867e7e5d9b17d028f57adcd6414208106954a37e6b

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