Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e399c1daf5bcb3…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 22:17:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 893a925df0a3b920e8a23a221a02e8c4 SHA-1: 2023be1e7b20dc76a837dfe72bdc6fe7e8388c68 SHA-256: 06e399c1daf5bcb3c59c0ed84423658659351e494d5c4c2eab1b7a44fc509a1c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs and document body text that strongly suggest a social engineering lure for free in-game currency or cheats, specifically mentioning 'Robux' and 'Coin Master'. The ML classifier also flagged this PDF as malicious. The primary URL, http://netcdn.tw/app/431946152/bux-life-free-robux-game-hack, is likely the download location for a second-stage payload.

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/bux-life-free-robux-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/tiktok-free-folowers-75_GM835599320.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-free-and-easy_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-change-username-free-no-waiting-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/money-in-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/anti-speed-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-cheat-engine-67_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-redvalk-code-roblox-news_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/are-private-servers-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD2 21952 bytes
SHA-256: 33c5bf820b1d5fe9e48ff7b74d5a8a61e606a9aa1baa7036cb5ec37914a97963
font_01_sfnt_off0000606f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606F 18836 bytes
SHA-256: 7f12d751da4e96ccad4d997d7560df235183c1e20666712b69b1e712c003bbe9

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