Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2da80b0a0a6c73…

MALICIOUS

PDF

42.0 KB Created: 2021-05-17 09:29:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a36daea1e1f9fbff25d5e1c83d19ac62 SHA-1: 53146fce0996d61a17b5cd3f9cfdb43e27cb3245 SHA-256: 3d2da80b0a0a6c739d6ac8a7148950ea38fccc79419b8fa1f35abfc12820c566
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically promoting 'free spins' and 'game hacks' for popular games. The document body and embedded URLs suggest a social engineering lure to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to a site that may host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/free-25-spins-coin-master-links-game-hack In PDF document text
    • http://www.hotel-seminaire.com/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/robux-link_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/getrobux-info_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/robux-come_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/how-can-you-get-free-robux_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_off00004bf2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF2 23620 bytes
SHA-256: 69ac500900c3cd4843cb3ea980ec6e91d88e9e6969838b5094b4a1f6e1b93e45
font_01_sfnt_off00008179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8179 18316 bytes
SHA-256: 7fa45621bf9a4728c899947fc0d1a2becd31993fea733f0a04eabb1660a2ec34

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