Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1cf525a86bca29…

MALICIOUS

PDF

42.9 KB Created: 2021-05-13 00:32:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d4c49762a48039f02f21a844c2368398 SHA-1: 47ad524b5e466324f99a8fee484eaf8a226957b9 SHA-256: fc1cf525a86bca29c9c7ec03799e71d9e5a863cf8f5f10838ed4a1940983ba7d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a direct link to a malicious redirector disguised as a game hack generator. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains references to similar lures. The primary attack vector is likely spearphishing attachment, leading to a redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/roblox-free-rubox-game-hack In PDF document text
    • https://nature-air.com.tw/upload/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-bux-free_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
stream_003_off00004a97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A97 25508 bytes
SHA-256: 9b8598a4bf5e696024697f42b671e7c1525f1c36711587253dbefd8f7dfe54d8
font_01_sfnt_off0000862c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x862C 18088 bytes
SHA-256: 03c92d59c548fbfdae08874221752d30f8caaed88781636bf7d18542e7c5fe52

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