Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56bd9fa849dee9c…

MALICIOUS

PDF

46.4 KB Created: 2021-05-13 13:03:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4c8ca83f0c2aa2b735eddddf50d97084 SHA-1: eec38bed5de1dadbf429cd11f95f285ba0155ae3 SHA-256: d56bd9fa849dee9c9406e5cd1336f965e704db3b100ce34937a7201da1987f14
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 point to other PDF files hosted on a suspicious domain. These linked PDFs appear to be lures for game cheats or hacks, suggesting a phishing or malware distribution scheme. The presence of a download button heuristic further supports the malicious intent of directing users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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.xyz/app/479516143/minecraft-bedrock-hacks-game-hack
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/www-free-robux-com_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-minecraft-bedrock-server-hosting_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-robux-com-roblox_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-spin-coin-master-game_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/master-coin-free-spin-daily_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-spins-free_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/minecraft-java-edition-for-free_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-get-free-robux-not-a-scam_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-link_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/can-i-get-free-robux_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-2021_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/roblox-earn-robux_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/robux-match_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-2021-free-spins-link-today_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/earn-free-robux_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-tool-apk-download_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-fan-page_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ea4.bin
1e4fdf74d26b6b20dc64eceb5df8eaf0d083e1047c1632ae181d1a62838412df		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA4 25696 bytes
font_01_sfnt_off0000892b.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x892B 2840 bytes
font_02_sfnt_off000092dd.bin
cdc10c07562964e95d3c60cab3c6d937b43618c1a43ea86bc4060c2923515875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92DD 18268 bytes

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