Malicious PDF — malware analysis report

Static analysis result for SHA-256 be750f6ccaa0d5da…

MALICIOUS

PDF

46.8 KB Created: 2021-05-12 05:14:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0be47208eb1fdd0a3b0ceb953a9a80ac SHA-1: 8ee213599b6c5e6c628a750485ac9c008eec521f SHA-256: be750f6ccaa0d5dad7d723de304eb683d1bb93232ea33dd870dcdab0fde8b677
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are structured as SEO-optimized slugs pointing to other PDF files. The document body and embedded links suggest a lure related to free game currency or hacks, indicating a potential phishing or scam attempt. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/431946152/how-to-get-free-robux-for-kids-game-hack
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-2021-no-human-verification_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-install-minecraft-for-free_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/robux-match_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/roblox-hack-generator_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.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/free-coins-coin-master-hack_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-spin-coin-master-game_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-game-download_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-spin-link-new_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/online-coin-master-hack-here_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/get-free-robux-gg_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-spins-free_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/minecraft-bedrock-download-pc-free_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/apps-for-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bc6.bin
f3db32bb4fde207678f683b13fd7fc92f6b6f73959251a72f8f89696804f8da6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC6 25652 bytes
font_01_sfnt_off000087ae.bin
e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87AE 3500 bytes
font_02_sfnt_off0000934f.bin
d8259766cf036cd113d0b26237eaaf1c704bfb1290fa2ba3336ef80e6ae93167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x934F 18576 bytes

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