Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e17d4a28074901e…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 03:41:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2b368471e7aa10489eee04b269664540 SHA-1: 712ead0b4f0955a1a1a2ac02fe306d6e1b0a4cba SHA-256: 9e17d4a28074901e225b348874afd40ac9a40ab35d439d66ba6a667c40939678
142 Risk Score

Malware Insights

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

The PDF document contains numerous links, identified as a 'link farm' and 'game hack lure', directing users to websites promising game cheats and currency. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and heuristic firings suggest the PDF is designed to redirect users to potentially malicious sites that could exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/how-to-hack-roblox-2021-game-hack PDF link annotation
    • http://perpustakaan.fk.unila.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-expert-sripters-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/pubg-uc-xtrcom_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/welcome-to-roblox-account-hacker_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E2B 22028 bytes
SHA-256: 3c1311c8f9578d76255eaec7ef3865505807c927927542cab3178a3d11c8498b
font_01_sfnt_off00005edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDF 19224 bytes
SHA-256: 952aa56c448a3876108b271681fe1a59f9d49131b8b4cd095e69c290d9073af5

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