Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb4d094af18e2b2…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 01:15:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0742e7d78707d5fcea1851f5566e8233 SHA-1: 2d591ee4fd11ed32b99c396239540a58c74c0f23 SHA-256: fcb4d094af18e2b23d5ee4dfa278009e6be84e6d471069a6fd59aeeac37829fc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one identified as a malicious redirector, http://netcdn.tw/app/431946152/games-to-get-free-robux-game-hack. The document body and heuristics suggest a lure related to game hacks and free currency, aiming to trick users into clicking these links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to deliver a secondary payload or lead to a phishing site.

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/games-to-get-free-robux-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/auto-speed-hack-legends-of-speed-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-picture-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-exploit-lua-script-executor-free-no-virus-please_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-gfx-free-render_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-gas-station-simulator-money-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-no-pass-required_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/site-robux-no-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/mad-city-unlimited-money-hack-roblox-2-26-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/pain-exist-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-2021-no-hack-or-download_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_off00002e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E49 22048 bytes
SHA-256: 48c13b15866b9ba5dd816fd528e36ea15ba2daaa2aab028f41bfdc783be753d4
font_01_sfnt_off00005efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFB 19080 bytes
SHA-256: 03ba3cd79afa517eed98ce6a768f8c6318a94a6bbf9eb4faa980b5a438220dad

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