Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51cfdbd1522185b…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 14:41:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: df317efbaa490df2417daeb4e016da26 SHA-1: d380b7cafef6c0c7fa6ebcb1f8f5e9833318c8cb SHA-256: c51cfdbd1522185bc99a6cd48f2c09ec095b58529f3c252fcc3aecb3c650c309
102 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious and contains a large number of external links, many of which are SEO-farmed and point to game-related hacks and free currency lures. The document body also contains a direct link to a potential exploit or malware download. The primary attack pattern observed is the use of a malicious document to trick users into navigating to potentially harmful external resources.

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-hack-roblox-top-model-wins-game-hack PDF link annotation
    • http://lib.stie-aub.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-audio-uin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/is-it-possible-to-get-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/tiktok-free-followers-and-likes-apk_GM835599320.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-gift-card-code-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-someone-on-roblox-vermillion_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/what-is-the-best-free-for-all-roblox-game_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-free-cards-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-ultimate-driving-money-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-i-get-items-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-links-for-coin-master-2021_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
font_00_sfnt_off00002e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E4F 22228 bytes
SHA-256: b40b9412ccf722a23f70855d2a1da93eb30f239a6e4209a767692debc59e481f
font_01_sfnt_off00005fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB1 19684 bytes
SHA-256: 99911bcb85aced86302761876da8687de6c6bb660630956df73d01a908f5b032

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