Malicious PDF — malware analysis report

Static analysis result for SHA-256 5676551e13adcfe0…

MALICIOUS

PDF

48.3 KB Created: 2021-06-09 09:53:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fd5a99cd2663e5acdde49d217282a5f1 SHA-1: 65b7af179dd60a58eb779ec8216a7627eb28bced SHA-256: 5676551e13adcfe014f3b9d26b23e5d813ef835452b055a9b9aa3727db780307
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, directing users to pages promising game-related hacks and currency generators. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/nuevo-hack-16sept-generador-de-robux-by-piignoiise-game-hack PDF link annotation
    • http://gc-sistemas.com.ar/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/roblox-game-cards-free-pin_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-sign-up_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-unused-roblox-game-cards_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/cheat-roblox-jailbreak-franais_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/arsenal-roblox-hack_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/250-robux-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5021 25496 bytes
SHA-256: fd28c81fb7315961b767b854cea0608b3147184f39db62b9bffa0ca1ce985499
font_01_sfnt_off00008993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8993 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off000094bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94BD 20000 bytes
SHA-256: bc95aecd6e0448f0f663e181d9dea07842afb00530c4fd450f153d26f2be9226

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