Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1d636005cc23ca…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 18:11:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c5f5cb163ab4dfe59d5fa70018c9e4a3 SHA-1: e0467a546ba9f83f4f5b2bb634628ca39352e51f SHA-256: 8b1d636005cc23ca8f89987fc3f658a7a3aa65a69f32a8d82b6caac21c3f194f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free currency to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, likely serving as a gateway to further malicious content or exploits. No scripts were extracted from this sample, but the PDF structure itself contains embedded URLs designed for social engineering.

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.tw/app/431946152/roblox-free-rubox-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-prison-life-hack-with-injector_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/gift-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-roblox-real_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-app_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/rbx-sites_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/como-ser-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00002f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F48 21812 bytes
SHA-256: 9ba00c3f1220ce34bc65befc23d5dcf56281ad353edf13d244dcb7f6274449f2
font_01_sfnt_off00005f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F46 18788 bytes
SHA-256: 240f26960413d3375b32b54d3a16c3eb3bd7324ec8649811f17e0fe1da2802cb

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