Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b784a3a6b8ca65…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 14:26:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-28
MD5: 10cc7886770411a4f61cda045c12561c SHA-1: 6c28b0cd9fd49cfe360414ba2139d9acd9721cda SHA-256: 72b784a3a6b8ca65442b909bc9eb92f8f76170301dfb14c74cb777559a9c2dd8
160 Risk Score

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/coin-master-free-coins-link-2021-game-hack In PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/roblox-assassin-free-knife-codes_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/roblox-hack-2021-john-doe_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/pokemon-go-free-643_GM1094591345.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/roblox-hacks-jailbreak-download_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-vpn-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/vehicle-simulator-roblox-speed-hack_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_off00002fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD2 22928 bytes
SHA-256: 167488f30b9cc4384ca279251b9f7672557d2f0a4a54a861a02ca7b9a50b811a
font_01_sfnt_off00006321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6321 18568 bytes
SHA-256: 5c6f2b8c8950227f34c0c7c762a0319831c5dcbb819f0110f1dbfe9ff8d1e338

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