Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cf76076faf5beb…

MALICIOUS

PDF

45.3 KB Created: 2021-06-11 03:22:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8d8be33ca56d6238aff8b98c94c17f6e SHA-1: bf802877eebc176b77d8ac4485a4fe1d23c7a709 SHA-256: 59cf76076faf5beb9a2f1ba35fea8195e08d14f34396751601a7f84615425062
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which are SEO-optimized and point to game-related hacks and cheats. The primary URL, https://netcdn.tw/app/431946152/roblox-mon-compte-il-fait-hacker-game-hack, suggests a lure for users seeking to exploit games. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/roblox-mon-compte-il-fait-hacker-game-hack
    • http://opac.stiesa.ac.id/repository/claim-roblox_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/roblox-free-bomb-jacket_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/free-spins-on-coin-master-iphone_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/more-robux_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/how-you-get-free-robux_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/tower-of-hell-roblox-hack_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdf
    • http://opac.stiesa.ac.id/repository/freerobux-co_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/hack-robux-using-chrome-web-store_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/mcpe-free-download_GM479516143.pdf
    • http://opac.stiesa.ac.id/repository/coin-master-fb-free-spins-link_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdf
    • http://opac.stiesa.ac.id/repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/free-tiktok-likes-and-followers_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005144.bin
3357cae93cf6bd7ebce5672e1c8e106c2359e70d2acce16432cf22790bc509a4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5144 25268 bytes
font_01_sfnt_off00008c09.bin
42e687b335dfbba46d7581156f451f5dc42704105afdc10b644c7822e9c66d9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C09 19204 bytes

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