Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf99cf910c76b24…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 10:39:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 771ab91d091b8d47246659cee59e4290 SHA-1: a705ee08c172cb212f94bd9fa79fbbe8cf8eea43 SHA-256: fcf99cf910c76b2484216dab65a3e2c21297bfee01508bc9d737caf22bf0d842
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, suggests a lure related to hacking accounts, and the presence of a call-to-action button further supports a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-hack-into-someone In PDF document text
    • https://ktphuhung.com/public/upload/files/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/free-spin-link-for-coin-master-game_GM406889139.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_off0000491e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491E 23964 bytes
SHA-256: 5c7254c6f6509e99a63fd0388171e312753729fd1f2f8b35175e54a0244d21dd
font_01_sfnt_off00007fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAB 18912 bytes
SHA-256: bf4ecd0153dd3a330a8d8544a3db10b129edd23679e66a7dba01ca4f284b0ccb

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