Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dacef66c48bfe95…

MALICIOUS

PDF

52.0 KB Created: 2021-06-11 05:58:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 46241692ef3f462eefd70364fa19e241 SHA-1: 20a0a12f50c4a3a9b624fac3bdac4b97171f7d90 SHA-256: 8dacef66c48bfe95c37b4d812a2cffc595773ec807049262e3f1c4818820d20c
82 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file 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 0.9464

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.tw/app/431946152/www.bandicam.com-hack-roblox-game-hack PDF link annotation
    • http://msfs-eastafrica.com/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/robux-free-roblox-glitch_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/creator-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-roblox-followers-no-survey_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://krnl.rocksIn 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_off00005c18.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5C18 26548 bytes
SHA-256: c7129945b9c546db3b9f951138d4da4698a78a5b33c22ef071d633862a75c1cb
font_01_sfnt_off00009a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A89 3512 bytes
SHA-256: d2fbe445e4228ea2e3d75d3e8f0f84124f9dd8d3d0cf2c6e4e63bcca92f2519f
font_02_sfnt_off0000a61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA61D 19164 bytes
SHA-256: 03ebf553c7c5b495f43c8f2f2a114a0e1a25369b53e30a06c6929c13d9d1195a

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