Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b81e85904c3f56…

MALICIOUS

PDF

45.5 KB Created: 2021-05-15 23:01:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 89bdf5fe895b7d6ab2474d932a3dc19c SHA-1: 0f90df38d53966b15cfaca55a97e57ee0cca33de SHA-256: e1b81e85904c3f56d6d5d4c3397a8a413a2f603567e4acc07bfa478c93417862
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass T1071.001 Web Protocols

This PDF document contains multiple lures, including a "free generator / game hack" and impersonation of Facebook, directing users to a suspicious URL. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely for credential phishing or to download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 6

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.xyz/app/479516143/minecraft-java-server-hosting-free-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.xyz/app/479516143/minecraft-java-server-hosting-free-game-hack PDF link annotation
    • http://lib.untad.ac.id//repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/generator-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-minecraft-skins-java_GM479516143.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
stream_003_off00004b35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B35 25628 bytes
SHA-256: 2121edc0fe4fd274a6e28b8a586f552320acbec0b3e31fac4458b5bec528c3d5
font_01_sfnt_off00008535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8535 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F45 18276 bytes
SHA-256: 5e44962821fb2565cfe95a9f549b7a0fbd0587c00345fc69eb3db563df392af4

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