Malicious PDF — malware analysis report

Static analysis result for SHA-256 838bb5510a21fc62…

MALICIOUS

PDF

40.5 KB Created: 2021-05-22 00:39:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 16052c5d5483af48199d6a26cbd4f954 SHA-1: cb9530540c8868a43274f5d9b6770ce4587dd8e9 SHA-256: 838bb5510a21fc62e812006218a59847861b0284d30d7b5c6e2b48b11c7e4d52
182 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, presenting a fake CAPTCHA and download button to trick users into clicking malicious links. The primary lure is for 'free TikTok likes' or game hacks, directing users to external URLs that likely host further malicious content or phishing pages. The document also contains callback phishing lures, suggesting a multi-faceted scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8308

Heuristics 7

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://anna-art.in.ua/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://anna-art.in.ua/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://anna-art.in.ua/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://anna-art.in.ua/images/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://anna-art.in.ua/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002fee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FEE 24288 bytes
SHA-256: b597af93c482adb79e96a5830377ec0938c1d6d74062722de9dbe1e8f5050f5d
font_01_sfnt_off000067a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A1 3372 bytes
SHA-256: dfbbf67cbc7ecc66ac4d03805ccfff7e5c1407898ea3c5e2b9241b85217ff1cd
font_02_sfnt_off00007322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7322 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_03_sfnt_off00007e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E35 17632 bytes
SHA-256: 7e13fbc4119f45c5ff512709f8e7b8078fcbed6cc64991a23ef627420002bfc1