Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bf23836a8a42de…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 11:34:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8c9bc7f564fde2ef6c984389349c29f6 SHA-1: 1806fdd1837755edeeae3da6d6b1f3713e3df359 SHA-256: b2bf23836a8a42deb96e4b0c441197bd7ade8ddeac1d1de71c2c548aa98dcf17
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an external URI pointing to a download link for 'free Robux', indicating a lure for potentially unwanted or malicious software. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to trick users into executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.online/app/431946152/free-800-robux-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/pokemon-go-free-battle-pass_GM1094591345.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-c9m_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
stream_004_off00005502.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5502 28088 bytes
SHA-256: 59e6e1ecaba0ff916bc1db65030f2eb8d7381d1bdf6dde4bb29aa1ff4a5ec623
font_01_sfnt_off0000956e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x956E 18396 bytes
SHA-256: 2059a7894931e9b75336f5975f03d939213f3fdb926ff7d6db67df9fd1731cb7

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