Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef7346857096ed0…

MALICIOUS

PDF

44.3 KB Created: 2021-05-16 12:22:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 330a57b545ad6d682e735006c1ff9a7a SHA-1: d6f0af522cc0a12bca36ad923bd49fe36134bb89 SHA-256: 4ef7346857096ed0b7da7f1c7f217c5094d2b95671ae1354adc48ffc31f9ee7a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized links to pages offering game cheats and hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure further supports a malicious intent. The primary goal appears to be directing users to potentially malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/hacked-roblox-game-game-hack
    • http://www.med-aid.vn/ckfinder/userfiles/files/is-there-a-free-version-of-minecraft_GM479516143.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/roblox-army-robux_GM431946152.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/robuxfree-con_GM431946152.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-free-spins-cheat-deutsch_GM406889139.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/free-robux-without-verification-2021_GM431946152.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/robux-hack-generator_GM431946152.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/free-money-and-spins-coin-master_GM406889139.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-spins-free-2021_GM406889139.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-claim-free-spins_GM406889139.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-hacks-for-free-spins_GM406889139.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/robux-generator-no-human-verification_GM431946152.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/free-roblox-executor-no-key_GM431946152.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/hacks-for-coin-master_GM406889139.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/free-robux-hacker-us_GM431946152.pdf
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-apk-mod-free-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c81.bin
8396509955ab77008dba5f39789e8b6ca13416b531db3ec76c6ab64d20b1ff6e
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C81 26104 bytes
font_01_sfnt_off000089b0.bin
43b97d228c7cd7fd1bba8da0f91b6cd3fc6d824cd96cfd86ffb9da3a0224d155
pdf-font-stream PDF embedded font (sfnt) at offset 0x89B0 18616 bytes