Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f40ef9fb0d59526…

MALICIOUS

PDF

44.5 KB Created: 2021-04-30 03:43:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: da749cbc5247e78dbf7105d0cafd0428 SHA-1: da16ad42b11fdde79b17d930cb991f957c0de774 SHA-256: 7f40ef9fb0d59526f69172c55ef83c1472da5a32f2a9d3c7d367a0ca4edd30f6
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake browser/software-install lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/synapse-roblox-free-trial-game-hack PDF link annotation
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/como-descargarse-hacks-en-roblox-jailbreak-agosto-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/download-roblox-pc-windows-10-free.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hack-para-jailbreak-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-cheat-infinite-jump-in-roblox.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/free-roblox-heads.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-2021-download.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-acount-info-hack-with-robux.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/anime-roblox-roblox-face-free.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-hack-jailbreak-dll.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/cant-open-cheat-engine-with-roblox.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_003_off000042cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42CC 26784 bytes
SHA-256: fe371b00ac0a3fa3841c63fe3ca52193827bd69c13426bbb4ae6a839684466b2
font_01_sfnt_off00007fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB3 3312 bytes
SHA-256: 40bd8eebcb3a0d68a8646f1930e84f30a44bfa48525263c6c528f0bc1e9c1677
font_02_sfnt_off00008b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B03 18652 bytes
SHA-256: 56baee63215eb5a2d453d6c96ed911d8ad44c4b143e2905b12e5ca4113b3f731