Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5de67c28b26b763…

MALICIOUS

PDF

41.7 KB Created: 2021-05-17 06:16:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 27a02560eefc1b6ad4d37dcfbad3036d SHA-1: 595cbdd3f41301c21beeae25501ef49fdd72c463 SHA-256: f5de67c28b26b763cd93534e2caf71a6ff050ff251fb3a2041ff6f0ca6a49742
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with a malicious link. The embedded URL, https://netcdn.xyz/app/406889139/sites-for-free-spins-for-coin-master-game-hack, likely leads to a second-stage payload download. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/sites-for-free-spins-for-coin-master-game-hack PDF link annotation
    • https://studentcareerinfo.com/images/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-robux-come_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://studentcareerinfo.com/images/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/daily-spin_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-800-robux_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/mc-hacks_GM479516143.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/game-give-free-robux_GM431946152.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_off000049c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C9 24544 bytes
SHA-256: 4480e0b3cb1396a904cfb97927b84a466cb919a7c1ac639418f7df5d1410705d
font_01_sfnt_off0000820f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820F 17884 bytes
SHA-256: 91ca8f62c0979a078180dc6a81f20f20b88a175a519d6a4650188b448ff1f25f

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