Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b6d7a1cd84c5c1…

MALICIOUS

PDF

46.7 KB Created: 2021-06-08 10:55:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1550a76ab43614e3bbc52b5f975822aa SHA-1: 88afbbd85d00f8a0786392f86c695f6355f8d96d SHA-256: f8b6d7a1cd84c5c194a203f34c6c19de799f4c6ac9904a6471cb2ad5046cd867
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which appear to be SEO-optimized for game-related cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic suggests a deceptive user interface. The primary attack pattern involves directing users to external URLs, likely to distribute further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/hack-robux-july-2021-game-hack
    • http://library.stipjakarta.ac.id/etd/repository/pokemon-go-free-gift-codes_GM1094591345.pdf
    • http://library.stipjakarta.ac.id/etd/repository/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/minecraft-launcher-download-free_GM479516143.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-robux-2021_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spin-sites_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spins-link-today-new_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-60-spins_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/info-roblox-com-robux_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/rbxcity-free-robux_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/robux-hack-2021_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-to-hack-roblox-2021_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/hack-robux_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/robux-generators-that-actually-work_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/earn-free-robux-for-roblox_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/minecraft-free-download-mac_GM479516143.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-ways-to-get-robux_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-rewards-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005169.bin
ad858382ab5a5a378ef4e5fa14bffd44300eea46f5682ed5ba96e1a1c8c9de9f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5169 28096 bytes
font_01_sfnt_off00009193.bin
543d88960636cd225eedafc2a72f978ab6f0983cc48ba70fd279af1374a1b1a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9193 19072 bytes

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