Malicious PDF — malware analysis report

Static analysis result for SHA-256 277b9dbce43bbb5a…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 07:47:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b25f2b4f776a7c9f71a25129192e9191 SHA-1: 6a0d4ca6ef99ff3635664a1ab03eb6e572b5ffc5 SHA-256: 277b9dbce43bbb5ae83aa4661ac6bd38d71f6a114704f1a271d078da3bd8dd8b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that point to known malicious redirectors, specifically advertising 'free generator / game hack' lures. These links are designed to trick users into visiting potentially harmful websites. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a campaign to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/free-robux-without-any-verification-game-hack In PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-robux-hack-apk-no-human-verification_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hawt-sauce-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hack-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-many-tiktok-free-followers_GM835599320.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/make-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/fly-hack-roblox-no-cheat-engine_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-face-roblox-no-hack_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hack-roblox-void_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-free-net_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hack-para-roblox-para-matar_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hacks-for-arsenal-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/minecraft-servers-that-allow-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
font_00_sfnt_off00003031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3031 22740 bytes
SHA-256: 5a4eb3a561e800414dcd051b1329b98697b66ce11ca46322c292269b6dc6e617
font_01_sfnt_off00006309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6309 19620 bytes
SHA-256: 98e25ba6f0db8882549c0e371305563de57acb07d7fce2330b7496bf897a2717

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