Malicious PDF — malware analysis report

Static analysis result for SHA-256 499ba61fa1c8f88a…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 20:50:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c8110d71a8f1667910f7eac7d48a6331 SHA-1: f5df301b9b33855ba28738b8ec15fc80a9fd3746 SHA-256: 499ba61fa1c8f88a936fa299627f6dcd0bf599a7a1da76624f17ebe2a97b62ea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as 'Roblox Hack' or 'free Robux' generators. The primary lure is the URL http://netcdn.tw/app/431946152/roblox-hack-2021-robux-2021-pc-game-hack, which is associated with malicious redirector activity. The document body and embedded URLs strongly suggest a phishing or scam attempt to trick users into visiting malicious sites.

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/roblox-hack-2021-robux-2021-pc-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-dumb-brothers-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/hack-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/febuary-2021-roblox-hacking-client_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-communism-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/raviz-cheating-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-on-roblox-mobile-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/want-free-robux-copypasta_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/hack-one-piece-millenium-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-group-members_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-jailbreak-robux-hack_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-card-generator-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hack-me_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_off000031be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31BE 22428 bytes
SHA-256: 4508a8a4c3be6601243c0d37caca813241e192572d28264852c510cfa492ded2
font_01_sfnt_off000063de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DE 19168 bytes
SHA-256: a49161e4fdfcc9990a114ea091c76b5dd4088bba5dbd573e381342acd8170751

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