Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3645e07fef5727…

MALICIOUS

PDF

37.5 KB Created: 2021-05-20 22:35:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7d8e75f98d7ddac9a6968e4fed4831df SHA-1: 079b85afb870f6c3109e491a3cc1dfe7c7ba4eff SHA-256: 6b3645e07fef57271ac94cc60b24f12f9833e477fb362d5bde9cc648b840e128
122 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA and a "Click here to download" call-to-action to deceive users. It contains multiple links to external websites, including one that promises "free Roblox toy codes" and "game hack" generators, strongly suggesting a phishing or malware distribution lure. The document's structure and embedded URLs indicate an attempt to exploit user interest in free game items to redirect them to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • 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
  • 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/free-roblox-toy-codes-game-hack PDF link annotation
    • https://ourlady-elearning.com/userfiles/files/robuxhub-net_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.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_off000031ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31EE 27472 bytes
SHA-256: a752c40d313cd3d622c613d3edf8cd4427b60e8bdde5619ecd44e0ac7f459956
font_01_sfnt_off00007115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7115 18300 bytes
SHA-256: 61c572cb3620b4cd8f14a1e394f9b91f9f748a9789523e43842f9c1d8904fae7

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