Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46e5e6bc5513b5f…

MALICIOUS

PDF

44.6 KB Created: 2021-06-09 08:46:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9c74dd033e20f55f4df0eb81b0c28156 SHA-1: 742a5bc9e2f7935b7619ea215071af7b0dfe0699 SHA-256: c46e5e6bc5513b5f02dc2e6e84e136cbc052e2526cdea8c573e9d0176e880a34
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'robux generators'. The primary lure URL is https://netcdn.tw/app/431946152/real-working-robux-hack-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/real-working-robux-hack-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/tiktok-free-trial_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/tiktok-free-on-google_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-online-free_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_off00005125.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5125 24576 bytes
SHA-256: 60103e252aa0fb3e2e0a1ee149faff84b3539da1198aa641c487b19219eae625
font_01_sfnt_off00008991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8991 18928 bytes
SHA-256: 5debbc6b1c96faec722322d4ab2af2cf5a309676de6d94c48dc7f0bf11157169

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