Malicious PDF — malware analysis report

Static analysis result for SHA-256 806b19a4d56470b8…

MALICIOUS

PDF

45.6 KB Created: 2021-05-11 00:45:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b500c0643eee73a449847570db603e73 SHA-1: ebf8012df9f4018ca4f9038540f6796453b5d68c SHA-256: 806b19a4d56470b804dad69b8d4d279246dbc6f6420cc9548ab5bdfb4e7e3e53
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 the document, likely to initiate a download. The embedded URL points to a resource that is likely a malicious payload. While no scripts were directly extracted, the PDF structure and heuristics suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/free-bobux-game-hack PDF link annotation
    • https://flyingchalks.com/ckfinder/userfiles/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-robux-now_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/body-roblox_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/rewardrobux-com_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/robux-hack-free-robux_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_003_off00004884.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4884 27072 bytes
SHA-256: ded68a9f390352cfa1f6357741d9797aea44acb912aed8d06604627376ca66f8
font_01_sfnt_off00008718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8718 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off000090b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B2 18012 bytes
SHA-256: 21a070aee0b4453f2f1d9cb5d53691f71c1a468eb04f2ae46e30da6bacbd91e9

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