Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb6befb6f2caa9a…

MALICIOUS

PDF

35.3 KB Created: 2021-06-27 21:56:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9d4c802b2e39284f19494d26c00db2e8 SHA-1: 8cb36533ba7618ba4aed8643ea99247cd40f6c96 SHA-256: 1cb6befb6f2caa9a106c06824bf2619a281c5c9e4485ec76f0ce32056e0a65e1
142 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and free generators to entice users into clicking malicious links. The document contains a high density of external links, many pointing to pages offering 'hacks' or 'free spins', and one direct link to 'netcdn.co' which is likely a download or redirector. The ML classifier strongly indicated maliciousness, supporting the conclusion that this is a phishing or malware distribution attempt.

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.co/app/431946152/roblox-offline-free-download-pc-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/como-instalar-hacks-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/prison-break-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/clothes-for-free-online-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-force-field-in-cheart-engine-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/real-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/nomend-diamond-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/este-es-el-unico-hack-de-robux-funcionando_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-hack-that-works_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/pokemon-go-free-items_GM1094591345.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_off00003217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3217 22328 bytes
SHA-256: 70eacd448a889db6f32747e9a0704ef0c320d71ae55a664f111bbc0b8166f158
font_01_sfnt_off000063dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DD 19428 bytes
SHA-256: d9c9be4b7044660b68b10f4bc053a7e84433bd9735ee15b70f1a38ac5b9bc32d

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