Malicious PDF — malware analysis report

Static analysis result for SHA-256 2139e2b02de0efca…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 12:57:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2b63138d4e6c0c8a15af20198986437f SHA-1: d5903af2eba7ce498461dd793adc6826749fc0d8 SHA-256: 2139e2b02de0efca7ba09631517046db37f2888cf4a6c44fc3ddbbd903df1a57
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacking and free in-game currency to entice users. It contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/how-to-hack-roblox-assassin-2021-game-hack, which likely serves as a gateway to further malicious content or downloads. The ML classifier also strongly indicated maliciousness.

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/how-to-hack-roblox-assassin-2021-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/get-free-roblox-hats_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-become-builders-club-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/all-roblox-bloxburg-hack-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-free-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-use-cheat-engine-64-on-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-redeem-card-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-codes-on-phone_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/dbz-rage-roblox-stats-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/como-descargar-roblox-hackeado-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/visenya-roblox-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/cool-hacks-for-roblox_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_off00002e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E33 21928 bytes
SHA-256: ea938b47cb26d4628349bb97438a470df87522b8995f201bc42c6882e7f26e76
font_01_sfnt_off00005e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9C 19340 bytes
SHA-256: f45b38d3a887b7db3466a3c2a18d21e3529cd2bdeabb4bdd2cfca1dda82c4147

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