Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c012f316165359…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 15:02:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e342a57930439af601c725ab6a828fe8 SHA-1: 8f778a0b8b91f71f1dadf0f050819078192e150b SHA-256: d1c012f31616535950284b1c1ef953f39db98d430382984953c936d96d9a9c11
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising free game hacks and generators. The ML classifier strongly indicated maliciousness, and the document body confirms a lure for free game-related content. While no scripts were directly extracted, the PDF's structure and embedded URLs suggest it's designed to exploit user interest in free items to redirect them to potentially harmful sites, likely for further payload delivery or credential harvesting.

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/479516143/try-minecraft-free-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/rbxraincom-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-flz_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/pokemon-go-free-4k_GM1094591345.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/infinite-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/5-sighns-that-u-have-been-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/noclip-hacks-for-roblox-arsenal-of-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-cheat-codes-for-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/does-roblox-hacks-your-bank-account_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-hack-on-computer_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/best-free-robux-sites_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
font_00_sfnt_off000031c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C4 22496 bytes
SHA-256: dc05d7e259d867fbcf4b90f4c266a6a8f873c46c60281d5f1035d364b88b26d9
font_01_sfnt_off000063a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A0 18036 bytes
SHA-256: 735085c12c9b9313aa1ff3cd51d3f8b84b47e84a017fb069310b851c719d56f1

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