Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cbf0c6a4fbb61b…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 18:25:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d8e730be3d28c4285b51b60e82b74844 SHA-1: 8f8a33b13d2c187ad6ed3e8bc9714c5ddd64ae0b SHA-256: 39cbf0c6a4fbb61b45f8fb4b09bd51e156fdbd970c20524181b01ba7841ae865
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 0.9980

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/479516143/aristois-minecraft-hack-game-hack PDF link annotation
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-hack-for-robuxs-on-robloxs_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/robux-hack-tool-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-level-3_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_off000032ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32CE 22100 bytes
SHA-256: 290f7f4d9bd893630270466c2adb5d87640b8719150644a4468e27314fa874ce
font_01_sfnt_off00006395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6395 18168 bytes
SHA-256: 271777a136a6f3efdfa034c086a74476d42872276a2731bd80599829abd26f21

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