Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb15c7910dee51b…

MALICIOUS

PDF

35.3 KB Created: 2021-06-21 08:55:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 584e1e9ac41dbbce80ab8f978e2dc446 SHA-1: e42e4cbba83b11f57b9373045375874c9bb99aff SHA-256: 0bb15c7910dee51b8b86e7635326ee61ad4b6167331ce770a360fdcc409e5d01
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are presented as hacks or free items for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these external links, suggesting a malicious intent to redirect users to potentially harmful content. The presence of 'LOLBin token sequence in document text' further supports the malicious nature by indicating attempts to disguise malicious commands or URLs within the document. The ML classifier also strongly flagged this PDF as malicious.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/robux-free-illimited-game-hack PDF link annotation
    • https://jormix.co.id/ckfinder/userfiles/files/ab-ble-to-do-n-roblox-pizza-place-hacks_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/comandos-cmd-juegos-hack-roblox_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/free-tiktok-likes-trial_GM835599320.pdfIn macro / runtime command snippet
    • https://jormix.co.id/ckfinder/userfiles/files/free-costume-roblox_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/In macro / runtime command snippet
    • 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_off00003172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3172 22588 bytes
SHA-256: 707e87c3affbcb83e7c151369e21e7ee87bf98709351a34e1c8ef0de90ca13a4
font_01_sfnt_off000063dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DD 19448 bytes
SHA-256: 0cacef57d6f06068f08424075b5eb093672ee05f0abdd5d0a441c60d4eee9bfb

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