Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3b7b3cf0ea1a3e…

MALICIOUS

PDF

34.4 KB Created: 2021-06-28 00:25:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ff0d2f0eee2f9a50754fe988e211aa5c SHA-1: 81202123c4f7145f52065e73f6d2d4ecf0a272b2 SHA-256: db3b7b3cf0ea1a3e324aa8c493c844b4daf0aa9d074458a05a3f364e32a7a8d1
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, including one at http://netcdn.co/app/431946152/free-clothing-roblox-templates-game-hack, which is presented as a lure for free game items. The presence of a download button heuristic further supports the idea that the document is designed to trick users into downloading a malicious payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-clothing-roblox-templates-game-hack In PDF document text
    • http://lib.untad.ac.id//repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-scripts-for-games-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hacking-account-website_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hacker-web-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-khaos_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/domino-crown-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/pastebin-free-robux-code_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-gift-cards-list_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/robux-generator-no-pasword-no-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hacks-boku-no-hero-roblox-vermillion-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-stuff_GM406889139.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
font_00_sfnt_off00002d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D86 22756 bytes
SHA-256: 8ff5c1c58391e1fffdeedfa251d0ec8698c5f67aa455c36e9b5d01b07079ecb4
font_01_sfnt_off00006044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6044 19476 bytes
SHA-256: 0655b418f21976b727817e08adfefb82b8f00a95fb9f53b514541ca5f0c7ae25

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