Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca84c88d487d327e…

MALICIOUS

PDF

49.8 KB Created: 2021-06-11 07:01:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 236682558ffd9feed51005e77c4e666a SHA-1: 24cd75194049cd61a7fbd5deb41a015d63fddb95 SHA-256: ca84c88d487d327e56daa7f1979bd7d003983f5088be495e0fdc3e81fba7ccb9
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9796

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/vehcle-simulator-hack-roblox-game-hack.
  • 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/vehcle-simulator-hack-roblox-game-hack PDF link annotation
    • http://lib.mappifhui.org/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-do-you-get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/cloudbux-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-spawn-in-working-gears-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/which-tiktok-free-movies_GM835599320.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-hack-elemental-battlegrounds-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-codes-2021_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
font_00_sfnt_off000052be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52BE 27364 bytes
SHA-256: 6189c29868678f63e5001193fb7ffa93cb3ec822225e1d8b70353eef5a1ef331
font_01_sfnt_off0000908e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x908E 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA0 19108 bytes
SHA-256: 52e53239dce06d06ec733c62e182d86df007b8a8babbf685f744c95c39184ad2

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