Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86d1e0568884057…

MALICIOUS

PDF

43.9 KB Created: 2021-05-12 02:13:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: afb3ae82fa47ec006c19e34defbeb38f SHA-1: f908a28c9c50943422ffea905d39fed6e0f09759 SHA-256: f86d1e0568884057cf2e421cbb9873ede93ceaba9ed5934549355bd437f47b80
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' content. The document body and embedded links suggest a lure for users seeking game cheats or currency, which is a common social engineering tactic. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-unlimited-spins-apk-free-download-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/coin-master-unlimited-spins-apk-free-download-game-hack In PDF document text
    • https://www.kaojen.com.tw/upload/files/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-demon_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/rbx-website_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-snacks-on-coin-master_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_off00004a1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1C 26476 bytes
SHA-256: c48c3e2b283d1e7814918208517b6a6ee7ea9e2eddc7c2ca9d25176589dd11bb
font_01_sfnt_off0000873b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873B 19084 bytes
SHA-256: c2d82cd4a12004e31f0bd3c8b1caf06db58ba118ed59957898480102bbe81bed

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