Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb4fb486713f5c0…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 17:43:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 981163ec2fac13e2d3882d5e9fa8e37e SHA-1: e661ab6ec1ffae47cdc0d8632fd1804f1592435e SHA-256: ecb4fb486713f5c0dcab8d5666f68aab9c3c2f0b37eb084650f2ec68d207ae7d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, including a primary malicious URL, designed to trick users into downloading unwanted content. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests a coordinated effort to distribute malicious files. The document body and extracted URLs indicate a lure related to games and free items, likely to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/479516143/play-minecraft-online-free-game-hack
    • https://elibrary.ikhac.ac.id/repository/minecraft-cracked-client_GM479516143.pdf
    • https://elibrary.ikhac.ac.id/repository/free-robux-with-no-download_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/how-to-hack-someones-roblox-account-with-cheat-engine_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-robux-no-wait-unpatchable_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-download-roblox-for-windows-7-32-bit_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/roblox-getting-hacked-full-video-of-it-happening_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-script-hub-roblox_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-robux-promo-codes-november-2021_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-robux-no-buying-anything_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-robux-today-no-survey_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/6x6x6-hacker-roblox_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-minecraft-for-kids_GM479516143.pdf
    • https://elibrary.ikhac.ac.id/repository/roblox-how-to-get-for-free_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/real-robux-generator-2021_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-roblox-redeem-codes-that-havent-been-used-august-2021_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/roblox-giant-survival-2-hack_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/how-to-get-free-ninja-animation-roblox_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/roblox-its-free-advert_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-robux-no-generator_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/roblox-black-panther-mask-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003181.bin
e646d60589820abb3fe21efb5b13bb6d8f377c662bc667656c19f5ffcec6b39d
pdf-font-stream PDF embedded font (sfnt) at offset 0x3181 22228 bytes
font_01_sfnt_off000062b3.bin
6af20249b3fc91c6ba778d93b5b7f70c4b9d84eb0b0988d9fc165060c8c986e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B3 18264 bytes