Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5421143bedd30c…

MALICIOUS

PDF

39.5 KB Created: 2021-05-21 04:42:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b9cad2bd9d08600ee557f0028d0b5837 SHA-1: d343e975e713aae6759df00a14d1446e489c04e3 SHA-256: 5b5421143bedd30c38294702c9fd583f0a409d469b093109eebaa84ee452b699
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating a lure for game hacks and fake CAPTCHA prompts, directing users to external URLs. The document body explicitly mentions 'Roblox Pink Free Robux' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', reinforcing the phishing attempt. The embedded URLs are likely intended to lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 6

  • 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
  • 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/431946152/roblox-pink-free-robux-game-hack PDF link annotation
    • http://huananhai.net/images/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/cm-spin-link_GM406889139.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
font_00_sfnt_off00003449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3449 25596 bytes
SHA-256: 13f764fff5e3b96e05ad03d35984dbac2296d5413aac391230b3249cc50642c7
font_01_sfnt_off00006e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E95 2888 bytes
SHA-256: dcdd98ee8e25436a83587ccb4027347dd2c3fcec95f3413942edd4086125bcca
font_02_sfnt_off00007869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7869 18532 bytes
SHA-256: 62e9169d40109a3abf4bdf842601a34c83c90693a7fee2a3f682a11a81f7ba3a

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