Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f90cc00a6c4d6b…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 23:11:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2b2d62a486b401fd16fc41f817aba7d4 SHA-1: c4da73f97a5d5362a89c764713a875f9a82269bc SHA-256: 23f90cc00a6c4d6baaca01a08f5578d959bd532a0b49855b5cffab05bae09044
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of offering free game currency or hacks for popular games like Roblox and Coin Master. It contains numerous embedded URLs pointing to external sites, such as http://netcdn.tw/app/431946152/how-to-get-free-roblox-game-hack, which are likely used to redirect users to malicious landing pages or phishing sites. The ML classifier also strongly indicated maliciousness.

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-roblox-game-hack PDF link annotation
    • http://perpus.masda.ac.id/repository/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-fly-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-fight-the-monsters-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-websites-legit_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/robux-apk_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-level-100-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-root-hack_GM406889139.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_off00003068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3068 22960 bytes
SHA-256: 5342c25f1d48c992989c25f4debe2de7b8d304928449c96134e0a31b0992c27f
font_01_sfnt_off000063e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E8 18920 bytes
SHA-256: 0cab8882f4c0675f5f492e8a84821542f7287f297f1ea8a50a76f0af58ce7d74

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