Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d43ff986b006aca…

MALICIOUS

PDF

35.3 KB Created: 2021-07-08 07:12:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ba7326735fb82bfd1211cb3d812df745 SHA-1: f34edd6ae3f97be34009611e2b5b4239a195e3c0 SHA-256: 1d43ff986b006aca6c94a5ce49a4e49a79fb188a3865a4596bb98aaeb35e71db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a call-to-action lure, strongly suggesting it is designed to redirect users to external sites for malicious downloads or phishing. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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 http://netcdn.tw/app/406889139/coin-master-daily-free-spins-blogspot-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-ios-robux-cheat_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-in-2-seconds_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/scriptexecutor-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-without-hacking-fast_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hacked-game-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/cheat-codes-for-bick-cars-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/400-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/irobux-com-redeem_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_off000031c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C2 23012 bytes
SHA-256: 6b3507f659854d1d5ffc9b07ec053a0e4f0d69c41d112b9103e488b760204d7a
font_01_sfnt_off000065a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A1 18812 bytes
SHA-256: 754165e748b1939f240fb960abb57fbe544f87d1813c38e81129662f3dc27bc1

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