Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7daf1ff2084a02f…

MALICIOUS

PDF

41.1 KB Created: 2021-04-28 02:43:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5748034e7302a8c0c9717fc6a0197efe SHA-1: 5c7aacf72700c6dd2e3aa0ec0dc798c5cca75cf5 SHA-256: a7daf1ff2084a02f7232f90fa6361bd804ce9a6002f4d931977ddbc43db18398
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent link within its body text, all related to game hacks and free currency for Roblox. These links, particularly 'https://netcdn.xyz/app/431946152/roblox-kick-off-hack-game-hack', are designed to lure users to external sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or scam campaign.

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/roblox-kick-off-hack-game-hack PDF link annotation
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-free-robux-hack-no-survey-no-download-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/tshirt-nike-for-free-roblox-of-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-account-roblox-wiki.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-builders-club-on-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-account-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/criminals-vs-swat-roblox-hack-script.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-do-you-get-a-free-robux.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-roblox-avatar-items.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-scripts-for-studio.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-someone-on-roblox.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_003_off000046f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46F8 24488 bytes
SHA-256: 3bcb3a5174ace9a350227a938c935c966390baf8242d4763f0fcd73f1956e3ec
font_01_sfnt_off00007ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF3 18300 bytes
SHA-256: 26ddf680762e346b5566c430dd54395a85e765d5753ad7da1079097ceb81a147

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