Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea93aa9e3abe5e0b…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 22:15:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 663fefd0ce47439c621f3cd3d493c6ce SHA-1: 24966f0bbeb64f989226eb36da1bf425112ac2aa SHA-256: ea93aa9e3abe5e0b8aec9c77510a73d14b1ae2fe7ba31e717c5e5c9f7282e106
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and text lures related to obtaining free Robux and other in-game items, strongly suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier flagged the PDF as malicious with high confidence. The primary IOC is the URL http://netcdn.tw/app/431946152/how-to-get-free-robux-hack-game-hack, which is presented as the main lure.

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/431946152/how-to-get-free-robux-hack-game-hack PDF link annotation
    • http://perpustakaan.stikim.ac.id/slims/repository/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-miners-free-true-overlord_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-hack-in-roblox-bee-swarm-simulator-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-roblox-card-codes-list_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/robux-get-com_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-hightspeed-roblox-with-cheat-engine-windows-10-universal_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-robux-in-minutes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/demon-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-jailbreak-money-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-roblox-exploiter_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-roebucks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-2021-robux-for-free-proof_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_off00002e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E4C 21876 bytes
SHA-256: 61bb149c373b95cda6fd36791e0e4bab38683b18c774b809a8b1d58117152e05
font_01_sfnt_off00005e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5A 19152 bytes
SHA-256: a9bff55de90b7722e0be476df1c7a65da1171d9638b3b21a902752e59eae7e63

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