Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4640f4d01307fca…

MALICIOUS

PDF

37.6 KB Created: 2021-06-27 22:08:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c9f1ebb346e681e9c84dc56ebaac7b58 SHA-1: 986697e7fd0caff1dea83af155a114bf3b2f3782 SHA-256: c4640f4d01307fca36ce7e65b91cd63d65fb2fa5ddb915e1b12f662990f95c00
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirectors, disguised as game hacks and generators. The document body and heuristics indicate a lure for users seeking free in-game currency or cheats, which is a common social engineering tactic. The primary malicious URL identified is http://netcdn.co/app/431946152/how-to-hack-roblox-for-robux-2021-without-human-verification-game-hack, which likely serves as a gateway to further malicious content.

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.co/app/431946152/how-to-hack-roblox-for-robux-2021-without-human-verification-game-hack In PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/i-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/how-to-get-free-robuxs-on-computer_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/free-gift-card-code-generator-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/como-ser-hacker-en-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/how-to-get-frozen-hair-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/roblox-free-builders-club-pastebin_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/how-to-use-the-sex-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/free-robux-generator-2021-working-downalod-no-downlaod-oddsfuspanish-translate_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/roblox-adidas-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/veil-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/how-do-u-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/how-to-hack-roblox-hax_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/easy-robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.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_off00003616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3616 22984 bytes
SHA-256: 8143ecf6785f11255468e0a16958412971119c154ce4589b15c0e27c5dcb8541
font_01_sfnt_off000069c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C9 20508 bytes
SHA-256: 52bf1326faab044ae5af190f61603e54921d44766a3179af92550dbe28dba858

Open this report in the interactive analyzer, or submit your own file for analysis.