Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cae20195de83f3…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 01:50:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: facebf982162c5dd40a5138d2956e777 SHA-1: 141f5d8c69f0fcb0fc9d095705b60c59303fdc84 SHA-256: 42cae20195de83f3a53c5a187e024937024663dbb6d7331c0e888b75e769ae9f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. 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 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/406889139/coin-master-free-daily-rewards-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-pokemon-go-2_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/is-there-a-real-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/haw-to-get-free-robux-obbys-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-gamepasses_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-a-free-dominus-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-free-robux-console_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/bux-life-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-friend-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/robux-gratis-2021-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-roblox-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-blue-adidas-shirt-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/pokemon-go-free-username-and-password_GM1094591345.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_002_off0000311e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x311E 22828 bytes
SHA-256: f7cca8e1167756e6268a14e4e4336355be02d34b1461b7f0be132a615c0bcccd
font_01_sfnt_off00006452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6452 18760 bytes
SHA-256: 3b011588543a7bb03f4503a293426fce4deabd47d84bd20145fbbd4cca3b0331

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