Malicious PDF — malware analysis report

Static analysis result for SHA-256 e142aba8c9f69fc9…

MALICIOUS

PDF

45.9 KB Created: 2021-06-11 08:05:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3aefe30dbb188103166d15f71ac5af0d SHA-1: 1cc9b708274c838f67df505f765bf2a0c0cf396c SHA-256: e142aba8c9f69fc9857855d90c3ac301543de148b46390ec9b4c99cab8c5802b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to known malicious redirectors, specifically promoting game hacks and generators. The primary lure URL is https://netcdn.tw/app/431946152/roblox-eat-or-diy-game-hack-game-hack, which is designed to trick users into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/roblox-eat-or-diy-game-hack-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/rlbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/working-roblox-hack-ddls_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/gold-cards-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-hack-me_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_off00005192.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5192 26696 bytes
SHA-256: 45cd84f1739ab44716cb8ad0b0e20071a111666edbd9cf39cbf65702bcb4a874
font_01_sfnt_off00008eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBA 19012 bytes
SHA-256: 5c2c7d52902cb8cce7d0aa28f67b37dacc78a7a8b046a22aa18bc19eef56fa67

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