Malicious PDF — malware analysis report

Static analysis result for SHA-256 418824e659660644…

MALICIOUS

PDF

46.0 KB Created: 2021-05-19 00:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5d62a444a78cf667bfe4b309bf3e3131 SHA-1: 6a078886fd41899a6b2c1a677e4d145d2e7eec14 SHA-256: 418824e6596606443f7dc7a947b98720493a8bf0248147184945aa72f5c62b74
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting "free generator / game hack" lures. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attempt to lead the user to a malicious site, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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 https://netcdn.xyz/app/406889139/free-links-coin-master-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-download_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/woman-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/minecraft-mods-download-free_GM479516143.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/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-hacks-no-verification_GM431946152.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_off00004d29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D29 25712 bytes
SHA-256: fdeb6e232c6912ef01fa6aa78bc805cc428129a9e805a6df552edcdc2ef371c1
font_01_sfnt_off0000869c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869C 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00009285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9285 17880 bytes
SHA-256: c5130e18caf6f7222c4492e4e2e2fc6b4580e14129763dcab090a363ad6db2dc