Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90b85564a21b336…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 14:26:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1532d0db689d906735aa22170de087bd SHA-1: a1d8907c2aa5d1c08db2913010e494633a06428d SHA-256: c90b85564a21b3369b8dfff72a8cd46ff9fbc8fb70142ba90332809e9cb79d82
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics suggest a lure for 'free generators' or 'game hacks', which is a common tactic to trick users into downloading malware or visiting phishing sites. The primary IOC is the malicious redirector URL, which likely leads to a second-stage payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/how-to-get-free-robux-on-robuxy-com-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-tiktok-likes-and-views_GM835599320.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/is-tiktok-pro-free_GM835599320.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-but_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-links-for-free-spins-2021_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
font_00_sfnt_off00005073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5073 25916 bytes
SHA-256: 56278c6a3058e6b19ff3af5eae0391c64241dd94decbd7a1e132baeac2003800
font_01_sfnt_off00008b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8B 18720 bytes
SHA-256: 91891dd9e571d2ff43b90d904cf18435816aa4ec69298c570868fde6f16ad394

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