Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4cd7f0a87d3952…

MALICIOUS

PDF

43.4 KB Created: 2021-04-25 12:15:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 25c71837540ee06c7251f5307ef284c8 SHA-1: 09f3c0b5ed3f06ffb441671c901704cff1c6d40d SHA-256: 9f4cd7f0a87d395244490d35069cc3109887ae924ae02de28ea2a82c29e879a0
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based 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 0.9868

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/free4mobile24-com-free-robux-game-hack PDF link annotation
    • https://lib-stie.yai.ac.id/repository/auto-clicker-download-roblox-bloxburg-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-today-ad.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/cheat-engine-cheat-table-roblox-scripts.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/descargar-roblox-hackeado-con-robux.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/hacking-games-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/if-roblox-was-not-free-part-2.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/best-free-non-virus-roblox-exploit.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robux-hack-dot-net.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-how-to-look-cool-for-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-glitch-xbox.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_off000041e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41E2 25316 bytes
SHA-256: e449e7aab00bdebc881c57852e498aa3106a2dc8b1d2f9b89a0d6bd1af11d9d3
font_01_sfnt_off00007cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB8 2900 bytes
SHA-256: 399b2e003bb834069e45b713d2a7ab1ae27ac92ef859a1f9fc91abcd16ae48de
font_02_sfnt_off000086bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86BD 18656 bytes
SHA-256: fd2b1c1199058676ffefbf95ed32858c5dfee9a232d005137544fcfd49833ea7

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