Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cb8dbb27c1ca5a…

MALICIOUS

PDF

35.8 KB Created: 2021-05-24 02:15:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4eb7872b12e1f072275c59965a620a16 SHA-1: a697cb7f699fd8dce03fd4d36008eb007ee41521 SHA-256: 68cb8dbb27c1ca5a56eda2b7fbcad2307bd6c70f308f275eeb6ee9f30b7935e4
102 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common lure for scams. It also contains multiple embedded URLs pointing to sites offering 'hacks' or 'free apps', suggesting a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 5

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/835599320/free-tiktok-likes-app-game-hack PDF link annotation
    • http://rosbk.ro/images/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://rosbk.ro/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://rosbk.ro/images/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://rosbk.ro/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://rosbk.ro/images/how-to-hack-roblox-accounts-on-phone_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_002_off0000340e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x340E 24876 bytes
SHA-256: 628c6699ac05f60b201e55aea8d96eb8e1585d6dada89aea2f23660d7666bbac
font_01_sfnt_off00006c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C77 17632 bytes
SHA-256: 7e13fbc4119f45c5ff512709f8e7b8078fcbed6cc64991a23ef627420002bfc1

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