Malicious PDF — malware analysis report

Static analysis result for SHA-256 4670b9791387f0d3…

MALICIOUS

PDF

32.6 KB Created: 2021-06-29 05:43:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 50303115999a57b73f698f8d0a5d8ee6 SHA-1: ab84f02593f9a4ca0c27ae8b3bf4bd58e6e19c4b SHA-256: 4670b9791387f0d3fda27b6aa1edaae8df22b89136e7cdc5100518f2da04d9fd
142 Risk Score

Malware Insights

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

The PDF document contains numerous links and a primary URL that promote game hacks and exploits, indicating a lure-based attack. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of outbound links designed to attract traffic, likely for malicious purposes. While no scripts were explicitly extracted, the nature of the content and the presence of external URLs strongly suggest the PDF is intended to redirect users to potentially malicious sites or phishing pages, possibly exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-hack-robuxian-secret-forum-hack-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/how-to-hack-piano-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/what-website-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/black-tshirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-roblox-accounts-2021-with-robux-bugmenot_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-clothes-on-roblox-on-your-phone_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/synapse-roblox-hack-price_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-hack-scripts-for-children_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/fd-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-draw-roblox-discord_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-how-to-make-your-character-look-cool-for-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-hack-someones-account-on-roblox-2021_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_off00002b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B9C 21228 bytes
SHA-256: 48b4a2c8f9be92334c3060aa0dcc8ff529e130411626b8d3df9ed340dc4f512c
font_01_sfnt_off000059bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59BB 19444 bytes
SHA-256: 3cdcb214cd52736c13708ef01a6fa2f43ab33c345fdd54f7628bcdd728c31ea6

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