Malicious PDF — malware analysis report

Static analysis result for SHA-256 d335b3bd45124cd3…

MALICIOUS

PDF

45.7 KB Created: 2021-06-10 22:45:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fd5a6d0019468125e26345d6f0a8f1c5 SHA-1: e2b2ac64ceca49ef0cd4eb219aad1c0e2453d603 SHA-256: d335b3bd45124cd37f27ebc3a68f5e5b4b2cb22b548c6d54a55ef6ce63fbd4f9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'free Robux' and 'game hacks', directing the user to a suspicious URL. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' confirms this behavior. The ML classifier also flagged the PDF as malicious. The primary IOC is the external URL used in the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/how-to-get-free-robux-no-verifaction-or-servey-game-hack PDF link annotation
    • http://vetmed.fkh.unair.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-robux-tennis-game_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/sk8r-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/shadow-raid-loot-cheats-roblox-notoriety_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_004_off0000524c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x524C 26328 bytes
SHA-256: 39d954352217914b19319e9fb2b1d78ad7ed90a24e2c358f036e006dfc2824ac
font_01_sfnt_off00008d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D99 19060 bytes
SHA-256: 9145b09cb5116481e796965104a24c1a58752c7ef074485e20f46891614ea6bf

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