Malicious PDF — malware analysis report

Static analysis result for SHA-256 caeda18a6b3c4e88…

MALICIOUS

PDF

33.9 KB Created: 2021-06-28 17:04:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9c59ebdc82834763c7fcb688826df641 SHA-1: 3530768b88821e94bc8a87b64c0209217e280436 SHA-256: caeda18a6b3c4e8858d76d22a1168a3ff170f6c4ac128ea3be70ca69a5441d93
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites offering game hacks and free items, a common lure for malicious content. The heuristic firings confirm the presence of malicious redirector infrastructure and a general ML classification of maliciousness. While no scripts were extracted, the document's structure and embedded links strongly suggest it is designed to lead the user to a malicious payload or phishing site.

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/game-on-roblox-free-items-on-the-catalog-no-hack-game-hack In PDF document text
    • http://bw.ac.th/userfiles/files/phlego-films-roblox-free-bsdge_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/can-pokemon-go-free-evolution_GM1094591345.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-roblox-accounts-from-2021_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-song_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-free-girl-hair_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-cheat-on-you-roblox-girlfriend_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-tutorial-2021_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-bedrock-free-download_GM479516143.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_off00002cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CBC 22556 bytes
SHA-256: 4ea41aa52635b72110ccf900d28d710840ae8c84feb6be05a76d97d84a27e81f
font_01_sfnt_off00005ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC5 19352 bytes
SHA-256: f9ad3bf9456b638dcd334dd55453574d9172cf8191158a12a40992fce8e176c9

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