Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c9a2e732c2ee9f…

MALICIOUS

PDF

36.4 KB Created: 2021-07-04 10:11:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6afb252dbb2ba86ab258125136ac7bf4 SHA-1: 0995c8f2107433e5273c67932e5a52b4d2215c2d SHA-256: 51c9a2e732c2ee9fc2ece5b96d1105f4d8064713d11eb1f50f3626fd9c46d1f1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appears to be a generator for in-game currency or hacks. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The document body and embedded links strongly suggest a social engineering tactic to drive traffic to potentially harmful websites.

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-websites-2021-game-hack In PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-card-code-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-aimbot-using-cheat-engine_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-girl-account-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-acually-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-codes-redeem-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-free-robux-no-inspect-no-pastebin_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-can-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-hack-gamepasses-on-roblox-ccv3_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-legal_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-hack-on-apocalypse-rising-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-roblox-download-no-admind-password_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/account-hacker-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-hack-any-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-no-human-verification-no-survey-no-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-health-hack-cheat-engine-64_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/fly-hack-for-roblox-2021_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
font_00_sfnt_off00003608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3608 22304 bytes
SHA-256: 2c009879785cace11af099a27737b4cc1365afdccd2421be6289e016a33310ed
font_01_sfnt_off0000679b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679B 19540 bytes
SHA-256: 7dbc8426627c63cb62956a50d2295124057d24afa4e6276b198320b3de5f5879

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