Malicious PDF — malware analysis report

Static analysis result for SHA-256 874b39981891edb6…

MALICIOUS

PDF

49.5 KB Created: 2021-06-08 23:41:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 86250f1e24fe15f1c538a1ffeff951f4 SHA-1: bbadae5d06803ccf456aaa62de286268a0531d4e SHA-256: 874b39981891edb6106f070e890d80eac89f8a6a969d3292891a8eaa8ff0beb9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as "free generators" or "game hacks" for popular games. The primary malicious URL identified is https://netcdn.tw/app/431946152/best-free-avatar-roblox-2021-game-hack. The document's structure and embedded links strongly suggest a phishing or scam attempt designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/best-free-avatar-roblox-2021-game-hack In PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-get-free-robux-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005283.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5283 26256 bytes
SHA-256: 8576b6db28571662d2d07c2121767d8818a78d59206fd6faf6a90f6442b17eb9
font_01_sfnt_off0000900f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x900F 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D21 18796 bytes
SHA-256: f5ed4fbbcbfd045991f4273124d28d4589f8be36fc352cb43a1e69c4340cfb91

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