Malicious PDF — malware analysis report

Static analysis result for SHA-256 e280f81bdcc805c8…

MALICIOUS

PDF

35.5 KB Created: 2021-07-02 06:18:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7472c39da67352f36aa588883ac345d6 SHA-1: bd926f8e161741227fdb5ad1b65a6dd4818efba0 SHA-256: e280f81bdcc805c8c6f83d2f7d0d4eec57b9fcfef577ff578a68e6ff77b01891
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 to http://netcdn.co/app/431946152/roblox-promo-codes-2021-free-robux-game-hack, which is flagged as a malicious redirector. The document body and heuristics indicate a lure for game hacks and free currency, likely leading to a phishing or malware download site. No scripts were extracted, but the embedded URLs and redirector behavior suggest exploitation for client execution.

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.co/app/431946152/roblox-promo-codes-2021-free-robux-game-hack In PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-easy-cheat_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-hack-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-robux-promo-codes-2021-november_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/robux-hack-no-offers_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/unpatchable-robux-hack-code_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-login-free-online_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-free-admin-for-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/new-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-roblox-on-chromebook_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-destroy-roblox-place-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/real-robux-hack-no-survey_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-do-you-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/hackear-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/play-this-game-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/fly-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-for-kids-no-vertification_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_off00002e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E92 23336 bytes
SHA-256: de68cd70e4ab5a9fe3c7d902ad89feb6995531b7ccace05823e9500da82fe824
font_01_sfnt_off0000636f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636F 19780 bytes
SHA-256: d1221995dad6ca164f1f1b01e2ff61b2da5252fcd31d8816337a4cc9cdb86cdd

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