Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ad31c67a60ebea…

MALICIOUS

PDF

35.8 KB Created: 2021-06-27 01:06:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 65c25cd913b5e14f2fcf03e8d5a9712a SHA-1: 2508ce8429ebfd29444acd9bb656a75f70922116 SHA-256: a4ad31c67a60ebea56ced4b1ed441205337413f825b149d27f9f932214053b4d
102 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, likely attempting to trick users into downloading unwanted software or visiting malicious sites. The presence of a "download button" heuristic, combined with a large number of external links, suggests an attempt to manipulate search engine results or host malicious payloads. The ML classifier strongly indicates malicious intent.

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/free-robux-codes-download-2021-game-hack
    • https://repository.stikesindramayu.ac.id/repository/free-boho-salon-roblox-application_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/robux-free-onlin_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/promo-codes-to-get-free-robux_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-cattlog-roblox_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/hack-coin-master-32-mod-apk_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-spins-coin-master-links-blogspot_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/roblox-jailbrek-fly-cheat-egine_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-clothes-on-roblox-ipad_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-dominus-roblox-script_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-400-robux-free_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-minecraft-survival-server_GM479516143.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-minecraft-account_GM479516143.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-robux-card-codes_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-hack-roblox-robux-with-cheat-engine_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/hack-all-computers-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032bf.bin
a95bd52ac4c069b47a4ca4fdcaa8ae370fca6488decfb7a53a3257a88ae35d6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32BF 22516 bytes
font_01_sfnt_off000064bd.bin
a44605e04da2527d6aae78252ad019f59e845cf7b3ba8f0abaac0fd08ec15b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BD 19696 bytes

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