Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e3927b9f405e8d…

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 12:50:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 35cd10222c6d7e6906b26d5aae619526 SHA-1: b46091c6d3befd1c9602eebbea76ca8938747486 SHA-256: b9e3927b9f405e8dfa31bdec50f4e52efa70b873be1c4fec36a379a0a6ef3eeb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to attract traffic. The presence of a 'download button' heuristic and a primary URL related to 'game hack' further indicates a lure to download potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

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.online/app/431946152/how-to-get-robux-easy-game-hack
    • https://ifef.es/ckfinder/userfiles/files/wurst-112_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-cheats-without-verification_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-java-edition-code-free_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spin-app-2021_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/robloxbux-us-generator_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-coin-master-spins-blog_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/jailbreak-roblox-hack_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-bedrock-hacks_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-codes-generator_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-no-verification-2021-ios_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-tiktok-likes-app_GM835599320.pdf
    • https://ifef.es/ckfinder/userfiles/files/robux-generator-no-human-verification_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/roblox-free-followers_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-spin-in-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-game-pack-with-google-play-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005017.bin
a5f9944616acc8f99c6ee4271ef17bd194c9f60d1dfe8be4d526a28da1338bbf
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5017 26492 bytes
font_01_sfnt_off00008c33.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C33 5696 bytes
font_02_sfnt_off00009945.bin
b9e2aa841985fb83527df95ccd87a01b1af2ca35417b0d42f05b7d7a63821dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x9945 18528 bytes