Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8d72a8461c01b1…

MALICIOUS

PDF

33.8 KB Created: 2021-07-07 15:12:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f979d46dc0686b85542791f584f09bf3 SHA-1: 3cce7f9f88b192b35ab0b64bb5684efcce4f8d2b SHA-256: 3f8d72a8461c01b1ff507cf0f0bff982cd9fa171a368dad3690497fa02561c69
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The primary redirector URL is http://netcdn.tw/app/406889139/moonactive-coin-master-free-spins-link-game-hack. This indicates a social engineering lure designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of embedded URLs and the nature of the lures strongly suggest a phishing or scamming 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/moonactive-coin-master-free-spins-link-game-hack In PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-to-get-free-lua-executor-roblox_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-do-i-hack-someone-on-roblox-with-edidthiscookie_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/comment-cheat-sur-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/free-robux-map_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/free-robuxgg-hack_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/roblox-rocitizen-money-hack-glitch-daily-bonus-patched_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/master-game_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/roblox-titan-simulator-hack_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-to-hack-a-roblox-server-2021_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/tycoon-simulator-how-to-hack-money-roblox_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-to-copy-any-game-on-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/help-im-being-cheated-on-by-some-roblox-girls_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/roblox-bubblegum-simulator-cheats_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_off00002fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA4 22144 bytes
SHA-256: 8a615cddd922e3a3d0c39b6adaecb669fe04224c82cf362c7238cfadd38fd576
font_01_sfnt_off0000609c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609C 18460 bytes
SHA-256: 2883425220e913a7562a99f4ec338813a638a2cee0d7b623b8123d2cd5a34c9f