Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a31e84b411bf1f…

MALICIOUS

PDF

41.3 KB Created: 2021-05-22 20:35:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a49443b625ff103d17f366f4111cd6e2 SHA-1: f3168443ee6759a74a0030ec1bede6ba919e8dcb SHA-256: 50a31e84b411bf1f4db420d8c44098574ebcba63e9a9177ea6f07873fdc4f4f9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and a call-to-action button, explicitly luring users with the promise of 'Free Robux'. The primary URL, https://netcdn.xyz/app/431946152/free-robux-exe-game-hack, is directly associated with a game hack lure. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8074

Heuristics 4

  • 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.
  • 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-robux-exe-game-hack PDF link annotation
    • https://bapalaye.org/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://bapalaye.org/images/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://bapalaye.org/images/robuxhub-net_GM431946152.pdfIn PDF document text
    • https://bapalaye.org/images/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://bapalaye.org/images/how-do-you-earn-free-coins-for-coin-master_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
stream_002_off00003491.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3491 29396 bytes
SHA-256: 15717eb2f95b2cafedcc0ab487bbd9a9b9055c524ad0be05661741b912d3dd59
font_01_sfnt_off00007770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7770 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8121 18012 bytes
SHA-256: 1e3fda203f08fe42ab00f6cef97e605bb68f7e374108f28afe3c353055d0c9d6

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