Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a13fc5d84f0a60…

MALICIOUS

PDF

48.4 KB Created: 2021-06-09 11:29:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8e447ffb6d2ce856cfa6ee09ec6c2966 SHA-1: ab689c2f615182d9a70f746b1c60fd22d373823c SHA-256: 99a13fc5d84f0a601ebd18d1afead9b0bf5aae68d7e4707e2e7496f2fddfd2d7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are presented as 'game hacks' or 'generators' for popular games like Robux and Coin Master. This indicates a lure-based attack pattern, likely aiming to redirect users to scam pages or potentially download further malicious content. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of these links were generated programmatically, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/robux-hack-fast-and-easy-game-hack PDF link annotation
    • http://www.jsvillas.com.tw/assets/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/why-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/does-pubg-uc-generator-work_GM1330123889.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-without-human-verification-2021_GM406889139.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
stream_004_off00005499.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5499 25296 bytes
SHA-256: 99f82a82a88505260fcce919f594b256f169d39515c99a7720c4424da85a03db
font_01_sfnt_off00008ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBF 2872 bytes
SHA-256: 5a38050e56bfed6ba013c4835499ae05f4b57b22e606c9172dd4bc2ae7fd1207
font_02_sfnt_off0000987b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x987B 18872 bytes
SHA-256: dfec56cc5b81d7690206875b09182c8152aed8686f43b5265458f8b76d5e923f

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