Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd29aa763615e5d0…

MALICIOUS

PDF

35.0 KB Created: 2021-07-10 01:09:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9bb81a5d1c88a293b7156f09d01c4dbf SHA-1: 21a8a196b4a5686bba86ab218a0bd5370966f94d SHA-256: dd29aa763615e5d001fb968935f3147bd04265c7c1e3fbc05fd72bcef9c43c08
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/how-to-setup-a-minecraft-server-for-free-game-hack PDF link annotation
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-robux-on-a-ipod_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/create-clothing-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/hack-prison-life-roblox-noviembre2021-br-5-370-vistas_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-items-in-dungeon-quest-roblox_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/hacks-robux-gratis-rapidos_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-robux-for-free-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-roblox-party-favor-tags_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-new-shoot-through-walls-hack_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-18_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-robux-instantly_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
font_00_sfnt_off000032da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32DA 22860 bytes
SHA-256: 0cb36f2ffff6c5ce39bfd244e3f7364b552280868c61c35511070e2abf0834ac
font_01_sfnt_off00006564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 18592 bytes
SHA-256: 4b40ee072286608b3d74a0cb4ed346ad8a5977f91bfb22046a7a3c91dcad46b1

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