Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5afed4666dc103…

MALICIOUS

PDF

33.8 KB Created: 2021-07-01 07:59:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b0cef5b69963037c81f0c2079875ecc0 SHA-1: 91ee45c7c76c177d86634330e6a8870a402bafed SHA-256: ca5afed4666dc103fe3a8621163cf0776eac9297e9c07ea867da644aa30f6467
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, employing a link farm strategy to direct users to potentially harmful content related to game hacks. The presence of numerous SEO-optimized PDF links, coupled with a high ML classifier score, strongly suggests an intent to deceive users into downloading or accessing malicious files. The document body and extracted URLs reinforce this by advertising "Robux Hack 2021" and similar deceptive content.

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/working-robux-hack-2021-game-hack PDF link annotation
    • http://muslib.unmus.ac.id/repository/free-robux-no-need-to-download-apps_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/2021-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/demogorgon-roblox-free-body_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-free-robux-without-survey-or-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-make-ur-own-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-to-get-clothes-in-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/windows-roblox-hack-client-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/pokemon-go-free-download-apk_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/yt-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/triga-cheat-engine-for-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-that-is-real-2021_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_off00002cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CB6 22092 bytes
SHA-256: 8f91fae3e54c405ef552e60fca9c1e038ae6062a30408ed68cd4cab473fb909f
font_01_sfnt_off00005d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D93 19440 bytes
SHA-256: ebbb72e49613df871abdcaed899fd2076eff69a0aa729afaf85467da4703e8ed

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