Malicious PDF — malware analysis report

Static analysis result for SHA-256 33790659debf5c36…

MALICIOUS

PDF

40.5 KB Created: 2021-05-13 15:01:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fde16c4d7dc2aca6ea0288d59307aec0 SHA-1: 4012543b3b5a205101a692c91d6aa5585ccd6618 SHA-256: 33790659debf5c367d70de555ab2c52fb0550cef5477c2afd566becbc8b4db67
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1534 Unsubstituted Attack

The PDF contains a lure for a "Roblox Free Robux No Human Verification" generator, which is a common tactic for credential phishing or distributing malware. It prominently features a link to a suspicious URL and a "CLICK HERE TO ACCESS ROBLOX GENERATOR" call to action, presented as a fake CAPTCHA or human verification prompt. The presence of a brand impersonation lure (eBay) further supports a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/roblox-free-robux-no-human-verification-game-hack.
  • 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-free-robux-no-human-verification-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000338a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x338A 25316 bytes
SHA-256: ea646a2b1b6b8b2cc3fd04a877cd7740ee20dd24de7a66ea01a1efc8c925c62a
font_01_sfnt_off00006e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E15 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00007b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B27 18932 bytes
SHA-256: 9d302b82f438100f3cf39adb1b208b926e457e77310e02e89ba7e0c774768e38

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