Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa3f573b1eba749…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 03:50:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ac222ea019bb3439c97af7e756506df9 SHA-1: 3d4cadf204b5f169d4e6ee8ce50021931d39c719 SHA-256: 8fa3f573b1eba7493bf91e2647aac1f3ac2e9a7d459a6eacef894657764fe03f
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-confidence heuristic firing for a game hack redirect lure, pointing to a suspicious URL. The document body, though partially corrupted, also contains this URL, reinforcing the lure. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be a social engineering lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/how-to-use-wifi-roblox-hack-game-hack PDF link annotation
    • https://lib.stie-yai.ac.id/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.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
font_00_sfnt_off000051b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51B6 25076 bytes
SHA-256: a783c0390b5d4dbe1a39e9e183203f56328492d6c3100d2f07bab5e55d9fa1f6
font_01_sfnt_off00008b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6F 18852 bytes
SHA-256: b9d630e50d6e3812a92e1c817a05ce04c2cd0025df3d3b8643c2dd62e0fde4d4

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