Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4053cdf0497f22…

MALICIOUS

PDF

41.4 KB Created: 2021-05-17 13:13:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 166adc8a8db46304ea52d67c40110d15 SHA-1: 519ad8d74aeb3485fec510d39db7520b9599497a SHA-256: ef4053cdf0497f22e5cf647c3e7b3088e07afbc339c29d30e4f5defed7ad12dd
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 for SEO spam. The document body and extracted URLs indicate a lure related to game cheats and hacks, such as Minecraft and Coin Master. The presence of a download button heuristic further supports the malicious intent of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-apk-1.14-game-hack
    • https://cleansui-home.com.tw/image/data/files/hack-coin-master-with-lucky-patcher_GM406889139.pdf
    • https://cleansui-home.com.tw/image/data/files/coin-master-hacking-news_GM406889139.pdf
    • https://cleansui-home.com.tw/image/data/files/free-robux-generator-for-kids_GM431946152.pdf
    • https://cleansui-home.com.tw/image/data/files/app-store-coin-master-free-spins_GM406889139.pdf
    • https://cleansui-home.com.tw/image/data/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdf
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-cards_GM406889139.pdf
    • https://cleansui-home.com.tw/image/data/files/free-robux-generator-2021_GM431946152.pdf
    • https://cleansui-home.com.tw/image/data/files/minecraft-the-complete-handbook-collection_GM479516143.pdf
    • https://cleansui-home.com.tw/image/data/files/free-minecraft-coins_GM479516143.pdf
    • https://cleansui-home.com.tw/image/data/files/robuxglobalcom_GM431946152.pdf
    • https://cleansui-home.com.tw/image/data/files/free-spins-for-coin-master-2021_GM406889139.pdf
    • https://cleansui-home.com.tw/image/data/files/coin-master-2021-free-spins-link-today_GM406889139.pdf
    • https://cleansui-home.com.tw/image/data/files/play-coin-master-for-free_GM406889139.pdf
    • https://cleansui-home.com.tw/image/data/files/how-do-you-hack-roblox_GM431946152.pdf
    • https://cleansui-home.com.tw/image/data/files/picture-roblox_GM431946152.pdf
    • https://cleansui-home.com.tw/image/data/files/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • https://cleansui-home.com.tw/image/data/files/rbx-website_GM431946152.pdf
    • https://cleansui-home.com.tw/image/data/files/can-you-actually-get-free-robux_GM431946152.pdf
    • https://cleansui-home.com.tw/image/data/files/how-to-send-free-spins-on-coin-master_GM406889139.pdf
    • https://cleansui-home.com.tw/image/data/files/best-way-to-get-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004943.bin
d6e33c897062f04c2fd221a51894eb9893d449f85cfcd668ae79ca1912330527
pdf-font-stream PDF embedded font (sfnt) at offset 0x4943 24468 bytes
font_01_sfnt_off00007fd2.bin
7bdfed4e6bb9116c1e8b762c9aa300c7ad7e0d5b74d60207ce67a22ebb633bf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD2 18148 bytes