Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7f73513227c9b4…

MALICIOUS

PDF

31.9 KB Created: 2021-07-20 04:31:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2abfdf0266cf070c8a5964ec45856a31 SHA-1: dfaa6ad64c241fe053f16280cb3975a025688d4e SHA-256: 3b7f73513227c9b4ea0da8a6dd2db450d8986e1a45bb762aeba48dc9b459e462
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and scam-related content, such as 'free generator' and 'game hack' lures. The document body explicitly mentions 'Free Minecraft Server Hosting 24 7' and 'CLICK HERE TO ACCESS MINECRAFT GENERATOR', reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/479516143/free-minecraft-server-hosting-24-7-game-hack In PDF document text
    • https://bc97.de/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://bc97.de/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://bc97.de/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://bc97.de/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://bc97.de/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://bc97.de/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://bc97.de/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://bc97.de/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://bc97.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://bc97.de/images/classic-minecraft-net-hacks_GM479516143.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_002_off000027b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x27B2 22572 bytes
SHA-256: 475b1d537098b5a9791cf2416e5227da5bec0405a975232787f573c4ced617af
font_01_sfnt_off00005a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2B 18352 bytes
SHA-256: 91a7490c887560cf1db9cb18ebb1e2a98db2d1ca6a1740dfb9f9cb38742cb9c1

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