Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84d9f23d602d164…

MALICIOUS

PDF

48.1 KB Created: 2021-06-08 21:09:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 460c96785d3c3b853335132d0cd72605 SHA-1: 1a9a211c912bd64bb7907b000242cc5b37ae5301 SHA-256: a84d9f23d602d164f388b940da4529cdf4af42bf5063e3c5f3fc1d48df74e6d6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier and contains a large number of external links, many pointing to other PDF files, suggesting a link farm designed to distribute malicious content. The document body and extracted URLs indicate a lure related to obtaining free Robux or game hacks, which is a common social engineering tactic. The presence of embedded URLs and the PDF structure suggest potential exploitation for client execution, possibly involving JavaScript.

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/games-that-actually-give-you-free-robux-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-robux-on-roblox-using-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-pc-no-human-verification_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-stuff_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_off00005241.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5241 25208 bytes
SHA-256: 92c92f345488bed10a0d44e280d677445052ea218656400626f416a24d1952e6
font_01_sfnt_off00008c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C23 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000095e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95E4 19424 bytes
SHA-256: 96697d64825f4553251d6eaf4e737c2743c03afaeabd20109f5868b8d0979a9a

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