Malicious PDF — malware analysis report

Static analysis result for SHA-256 4245cb7d22a6d771…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 07:05:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 97398849a2ce95225bd0dde2a161229f SHA-1: 7b20a2b5aee5c030ff496a715bff9a663254cad7 SHA-256: 4245cb7d22a6d771987e3fd3f8b0588b5e9982c82e4f72acd7a41104d1c2bb6f
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 0.9865

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.online/app/406889139/free-google-play-promo-codes-coin-master-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.online/app/406889139/free-google-play-promo-codes-coin-master-game-hack PDF link annotation
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/tiktok-free-liker-apk-download_GM835599320.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/minecraft-hacks-115-2_GM479516143.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_off00004e25.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E25 26888 bytes
SHA-256: 3856eb9059fb0910ca0700f4b263df20764ee3ddde2051ccc0397e33c2c54b68
font_01_sfnt_off00008b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B36 18840 bytes
SHA-256: 390da4ab381e5da0f3a1dba4b04518bf56609a6cb8a6a234a2d345ffc47ec2de

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