Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4a707dc9898e16…

MALICIOUS

PDF

51.6 KB Created: 2021-06-09 13:22:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7eba90f90b4db2a979d5ca60c7134d95 SHA-1: 59bd9763a8d1a5d196887b5f7171de2ff5359eee SHA-256: db4a707dc9898e1647bff1a396ec6cec20927d9398e649a92fc9fdff89b86cf2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Roblox accounts' which redirects to a malicious URL. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or credential harvesting attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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/free-roblox-accounts-user-names-and-passwords-2021-game-hack PDF link annotation
    • http://solidcommunication.ch/images/free-fans-on-tiktok_GM835599320.pdfIn PDF document text
    • http://solidcommunication.ch/images/can-pokemon-go-free-evolution_GM1094591345.pdfIn PDF document text
    • http://solidcommunication.ch/images/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/roblox-kill-hack-script-fe_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/coin-master-strategy_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/hack-de-dinero-para-jailbreak-roblox_GM431946152.pdfIn 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
stream_004_off0000522a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522A 31108 bytes
SHA-256: f31826a8f34f622d61d4cc01a834429abc14adf653ca64f8b45e811a168227b6
font_01_sfnt_off000098d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98D9 2908 bytes
SHA-256: e28d2c57f35643e2026f86c34ac3bb63cba74be3f6c066e81aba6d285e5a121b
font_02_sfnt_off0000a2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D3 19760 bytes
SHA-256: b6e660a648be4284aa933499290207b8ef5e8357c3b8d0b1b87bc1e29b3df363

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