Malicious PDF — malware analysis report

Static analysis result for SHA-256 730a35dd0ebcfabc…

MALICIOUS

PDF

45.5 KB Created: 2021-06-07 07:27:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 41a00f23aa0191e2433f52fcc1cd2145 SHA-1: 0972b0f79b307e1f31d18380b6b06fff7be4fa65 SHA-256: 730a35dd0ebcfabcc4cd34f1a9ed5b4448ab9a7c106fc5e6a6a57ee5dd6d2c39
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm designed to attract users searching for game-related cheats or hacks. The primary URL points to a "free Roblox Robux Generator" lure, indicating a social engineering tactic to trick users into downloading a malicious file. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/free-roblox-robux-generator-2021-no-human-verification-and-survey-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-use-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pokemon-go-free-3-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-pet-food-on-coin-master_GM406889139.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
stream_004_off000050af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50AF 24916 bytes
SHA-256: 7ab50afe2ac6cc9a029058150935712b574bcc87aa477af5f7d6a544474aadcc
font_01_sfnt_off00008a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7F 19804 bytes
SHA-256: c10e6cc08e1b6e5d9d727b91200fdba2a0800ccff5947bc120467b34c396900a

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