Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25fb09a81cc1ab5…

MALICIOUS

PDF

50.8 KB Created: 2021-06-03 13:25:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 46bedfd80cbb020dafd13c9a9f947c62 SHA-1: fe233645063e375c16671ae29e00de9019325142 SHA-256: d25fb09a81cc1ab57f3360484508a634336ba6d281b1455ce4710ed5e4911e5f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically promoting 'free generator / game hack' content. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick the user into navigating to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.online/app/431946152/robux-websites-that-work-game-hack In PDF document text
    • https://www.armera.co.uk/uploads/files/files/what-is-wurst_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/pubg-uc-trick_GM1330123889.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-spins-coin-master-daily_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_004_off000055f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55F2 34992 bytes
SHA-256: ad15cdcded0d1324f27e3d0fac01dc0515f5e27dea03cc0f23c7da826b3564c3
font_01_sfnt_off0000a2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A4 18836 bytes
SHA-256: f41676629f29ed6a42ccacba259d9acdb79474bce0625b7b45fdd4d276e33c05