Malicious PDF — malware analysis report

Static analysis result for SHA-256 2050987e96391687…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 10:19:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8a06b948c21c49f6dad1c77ce85b9188 SHA-1: 83d422c5f93f0417dc8231edf21b74bea5e5ca6d SHA-256: 2050987e963916871d129d29cc1bdd706d069891370bcc559d243e6852bd4d11
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a redirector lure, specifically advertising a 'free generator / game hack'. The primary URL, http://netcdn.tw/app/431946152/easy-roblox-hack-2021-game-hack, is identified as malicious infrastructure. The document body and embedded URLs reinforce this lure by mentioning game hacks and free items, aiming to trick users into clicking the malicious link. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/easy-roblox-hack-2021-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/lila-plays-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/robux-gives-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-robux-for-free-on-ipad-easy-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/speed-hack-in-any-roblox-game-2021-not-in-jailbreak_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/buy-robux-free_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_off00002ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFB 22132 bytes
SHA-256: 86009316eec70f7ccdd476d33d0c08ed1a5c501c34eb26baa071e5a1f99db9f0
font_01_sfnt_off0000612c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612C 19052 bytes
SHA-256: 2dbfe9eafdc830ba63b7614d095fbc0c49c2ae52828b1a77be1857d0981bf494