Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e15cc7924d21110…

MALICIOUS

PDF

44.2 KB Created: 2021-06-11 04:11:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a6a6250b99606e12cfd020bb22dfaf34 SHA-1: 3d7278f4ca6748dd279c902e76278691a6176dec SHA-256: 1e15cc7924d211104d3dafaf29b7dc257157523e9fd4f65d2b914a901464092f
122 Risk Score

Malware Insights

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

The PDF document contains a lure for a game hack, impersonating Microsoft, and directs users to a malicious URL. The ML classifier strongly flagged this PDF as malicious, and the embedded link is associated with credential phishing and redirection to a suspicious domain. No scripts were extracted, but the PDF structure and embedded links indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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/hack-robux-ilimit-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/hack-robux-ilimit-game-hack PDF link annotation
    • http://lib.untad.ac.id//repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/camisetas-de-hacker-para-crear-en-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/tiktok-free-robux-hack_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/tiktok-free-trial_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-free-items_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-roblox-servers_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
stream_004_off00004eb8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB8 25040 bytes
SHA-256: ec6536c7875a4c0d8ecb880b40ea4ae67ccb3f659c7b8f50d306f8508e51e986
font_01_sfnt_off00008870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8870 18808 bytes
SHA-256: 25c6d46f1ac8f8a3b7111a3411ca806dff98f81314fe086144c712787cf14a23

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