Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91671d22e1170d7…

MALICIOUS

PDF

33.8 KB Created: 2021-06-17 17:13:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 161d2696d28d67e91e9a8e691a9a89a9 SHA-1: 161d2a7ed4b730147863567d8945e1bedeadfbb8 SHA-256: f91671d22e1170d71ae5e1a3b014519247f953b3a3aa4ab012ff733d85d576aa
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are presented as 'SEO link farms' pointing to game-related cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The primary goal appears to be directing users to external sites that likely host further malicious content or scams.

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-promo-codes-august-2021-game-hack PDF link annotation
    • http://lib.mappifhui.org/repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-robux-hack-without-download_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-detectec-cheat_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/hack-configuration-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-rush_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/jailbreak-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-gift-robux-on-mobile_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_off00002c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C73 21856 bytes
SHA-256: 44cce49a76e3751557e55e76a9d5d7abab7674de89a5aa433498f6074dd846c4
font_01_sfnt_off00005c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C91 19808 bytes
SHA-256: f4ff1ec4f23d91492e7ea1854a476bfd6ab4b87d1351559d953096395b6b9293

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