Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadd042d134eb15b…

MALICIOUS

PDF

35.3 KB Created: 2021-06-26 03:14:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d8342a4b1d3d0c40eb19749d7a32a52a SHA-1: a6378fe2956425e4e02bbca093326f6e01daa2a1 SHA-256: fadd042d134eb15b6698545fa0f956ca6fc92dd16a087794bae6b92e95884a32
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links to external websites, many of which are algorithmically generated and appear to be part of a link farm designed to attract users searching for game cheats and free in-game currency. The document body and heuristics indicate a lure for popular games like Roblox and Coin Master, suggesting a phishing or scam campaign. While no scripts were explicitly extracted, the PDF structure and link farm indicate malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://netcdn.co/app/431946152/roblox-robux-hack-no-password-game-hack
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/twitter-coin-master-free-spins-link_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-use-cheat-engine-to-level-up-faster-roblox_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/mine-minecraft-games-for-free_GM479516143.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/roblox-promo-codes-free-robux_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-disney-plus-accounts-tiktok_GM835599320.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/coin-master-32-mod-hack-apk-download_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/comment-hacker-robux-sur-telephone_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-robux-generator_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-xbox-one-2021_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-coins-coin-master-link_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-get-a-free-minecraft-account_GM479516143.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/coin-master-coin-hack_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-roblox-followers-generator-2021_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/can-you-download-minecraft-for-free_GM479516143.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/pubg-uc-website-free_GM1330123889.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-noclip-2021-roblox-cheat-engine_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003255.bin
d6bfa4023ca389c972f19cf49d6e774266bcb0e7475cfe5d9218175f3cb1f241
pdf-font-stream PDF embedded font (sfnt) at offset 0x3255 22368 bytes
font_01_sfnt_off00006425.bin
ef8efcf9b4e8f3aa3adcf005ae876f9feae18d9a326f1b9881faa2555fc7835f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6425 19288 bytes