Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9198de9cd142d86…

MALICIOUS

PDF

32.6 KB Created: 2021-07-19 12:13:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7bbca89c4a74959ebcb369dcff46d85d SHA-1: 4863f7f0857a6370c114f712ce8dc1ed7214b817 SHA-256: b9198de9cd142d863797c51152866b3fa3a18540f6c63cd65ce065d7d5a7dd38
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/406889139/free-spins-for-coin-master-app-game-hack PDF link annotation
    • http://www.lycee-langevin-wallon.com/images/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.lycee-langevin-wallon.com/images/make-free-robux_GM431946152.pdfIn PDF document text
    • http://www.lycee-langevin-wallon.com/images/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.lycee-langevin-wallon.com/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.lycee-langevin-wallon.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.lycee-langevin-wallon.com/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.lycee-langevin-wallon.com/images/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.lycee-langevin-wallon.com/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.lycee-langevin-wallon.com/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://www.lycee-langevin-wallon.com/images/robux-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
stream_002_off00002b12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B12 23068 bytes
SHA-256: 36f2fba6d56dbfe6e490037bc43a83a4ad1a9b724d75efe98d77b7b5482eca3b
font_01_sfnt_off00005ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC8 17884 bytes
SHA-256: c0e07e045f0496ba68af439e810d5bb13e23b0d850ef9426c095223eaa712aa7

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