Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31ec5107b3c2965…

MALICIOUS

PDF

36.0 KB Created: 2021-07-04 01:25:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c21e212f4bf11dbbec03b0cf5d8c46bb SHA-1: 5bad5d2d6110ebff246be7227f167b113fbf097b SHA-256: c31ec5107b3c2965fecc87c224bcd737f2806756ee3a3d7ff571ec324be65ca1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures related to 'free Robux' and game hacks, directing users to external URLs. The primary URL identified is http://netcdn.tw/app/431946152/how-to-get-free-robux-2021-easy-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely using a social engineering tactic to trick users into downloading a payload or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-get-free-robux-2021-easy-game-hack PDF link annotation
    • http://elib-sd.msj.mis.sch.id/library/repository/how-to-hack-in-entry-point-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/what-game-does-not-hack-you-when-you-get-robux_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/how-to-get-admin-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/free-robux-gift-codes_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/roblox-cheat-table-mm2_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/god-mode-hack-roblox-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/roblox-my-girlfriend-cheated-on-me-video_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/how-do-you-make-a-shirt-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/hydra-roblox-game-that-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/how-to-get-r-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/roblox-phantom-forces-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/gamepass-roblox-free-client_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/roblox-cash-hack-script-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/how-to-know-if-you-have-been-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/how-to-get-robux-for-free-2021_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_off000033c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C4 22500 bytes
SHA-256: d9f2d6d329ebfefdffb4f3674759f94aa9a518cf99956ec3a86faf473af8c3e8
font_01_sfnt_off000065ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EE 19568 bytes
SHA-256: 54573245d87bf425d09f38ae69d600f60ea89f6a8aa7cff0a6b46d42a5179ab9

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