Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef44f0445690362c…

MALICIOUS

PDF

43.4 KB Created: 2021-05-22 02:52:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f0f843dc1b05768843b10d9fc81c52f7 SHA-1: a04344fb9d14824bb5fd0ba5a8a4d31612eaaebc SHA-256: ef44f0445690362c08dc1ada31628b7ae7e5b885e17ec4845d855930c01d04d0
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 0.7429

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-doing-anything-game-hack PDF link annotation
    • https://elearning.manbinjai.com/__statics/gudangsoal/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://elearning.manbinjai.com/__statics/gudangsoal/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.manbinjai.com/__statics/gudangsoal/files/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • https://elearning.manbinjai.com/__statics/gudangsoal/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://elearning.manbinjai.com/__statics/gudangsoal/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://discordIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35B4 29484 bytes
SHA-256: ec68088aaf331580a7a54c038fda461db3e4dcabc81413ca35d9afa6523538cd
font_01_sfnt_off00007806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7806 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00008518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8518 19400 bytes
SHA-256: 843e7c6de0628ecb74dfde19cdfb212261a67f0d6d996bc16e2547f6c0bce3d3

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