Malicious PDF — malware analysis report

Static analysis result for SHA-256 f913b731344ca9d9…

MALICIOUS

PDF

36.2 KB Created: 2021-06-19 14:08:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 515713a7d9b41854abbe63d8ca0a7a54 SHA-1: 5507911035dce5051af9535d7483018b505e9509 SHA-256: f913b731344ca9d97ead587a4487069dd9cdcf14046bc473d9338f39dfbfe259
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a malicious lure, employing a link farm strategy to direct users to pages promising free in-game currency or hacks for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, including one to 'netcdn.co', supports this assessment. The document's content and structure suggest an attempt to trick users into downloading potentially harmful files or visiting scam websites.

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.co/app/431946152/roblox-hack-attack-wiki-game-hack
    • https://mayunisma.sch.id/__statics/gudangsoal/files/free-robux-no-download-or-verification_GM431946152.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/get-me-robux-for-free_GM431946152.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/how-to-get-free-clothing-on-roblox_GM431946152.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/coin-master-hacks-that-work_GM406889139.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-link_GM406889139.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-without-human-verification_GM406889139.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/how-do-u-get-free-robux-2021_GM431946152.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/dominus-roblox-free_GM431946152.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/hack-coin-master-spin_GM406889139.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/coin-master-free-spins-today-daily-links_GM406889139.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/free-robux-without-verification-2021_GM431946152.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/free-spin-link-in-coin-master-game_GM406889139.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/coin-master-link-daily-get-free-spins-amp_GM406889139.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/coin-master-online-hack-link_GM406889139.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/rare-free-links-to-coin-master_GM406889139.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/free-robux-without-downloading-anything_GM431946152.pdf
    • https://mayunisma.sch.id/__statics/gudangsoal/files/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdf
    • https://www.roblox.com/.I
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035f6.bin
eb85df899f78799dad34a67700398b85b0e75d4435b01607eaf4224c611bf5d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35F6 22704 bytes
font_01_sfnt_off00006883.bin
72f75d82df3a5a230515283d4cb4aa8ced6936d6df6d345a90ed5fc783525400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6883 19076 bytes

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