Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc87629dbd01d4f…

MALICIOUS

PDF

43.3 KB Created: 2021-06-11 08:04:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 731b8a152d9e40a438a73a46a73afc4f SHA-1: 6aab932c5d65e74d2865147cd7878000722768e3 SHA-256: bfc87629dbd01d4fc1195a6ad8c8e94fbe17220f0ba74ce8be5a9a1648981890
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, leading to a lure for game hacks. The document body, though partially corrupted, contains text related to 'Free Play Online Roblox' and the malicious URL. The presence of embedded links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/free-play-online-roblox-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/master-coin-free_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/royal-navy-ships-free-models-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/tiny-tanks-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d18.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D18 24564 bytes
SHA-256: 34c53045da7d2b8198d7d58bfccf02abad96626e8e6ea0ade99605c5cc792835
font_01_sfnt_off0000859c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859C 18628 bytes
SHA-256: c211be421dcd1f0b6b10290cb1e78a5d37ba75df16dcbebab103b0667cb0e8d7

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