Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d69dfddce329f6…

MALICIOUS

PDF

40.6 KB Created: 2021-04-26 12:33:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a791934384dcf3d8be54dc19e932f155 SHA-1: aff86cac212e0670ad6237e589867138cebb6903 SHA-256: 27d69dfddce329f6d4b9f2336251b960b761a7fdacd6eb0c1867c64e1a2989d3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a lure related to 'free Robux' and game hacks, indicating a social engineering attempt to redirect users to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports this assessment. Although no scripts were directly extracted, the document's structure and embedded links suggest it's designed to facilitate a download or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/how-to-get-free-robux-2021-june-game-hack PDF link annotation
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/play-roblox-games-for-free-no-download.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/best-free-roblox-tycoons.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/noob-vs-pro-vs-hacker-roblox-pet-simulator.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-hack-out-of-bank-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-hack-mod-pc.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/bux-com-free-robux.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-draw-2-roblox-save.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-cbro-cheat-spots.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-hack-kavra-rolplay.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-gift-card-code-free-legit.pdfIn PDF document text
    • https://freerobux.cyouIn 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_003_off000040e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40E6 25672 bytes
SHA-256: eb476e8c0169903b503e506012cd1c9d229bb47f7f314f1b6c2f92029f1736d7
font_01_sfnt_off00007b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0A 18848 bytes
SHA-256: eebbea63f9c368ecf0e75776cad65876bf905a17105a768f4d51b4327f50d96a

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