Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51b712abe3ad8bb…

MALICIOUS

PDF

42.5 KB Created: 2021-05-14 23:41:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 18149c63b1bb13c912e21a88181fef3c SHA-1: ab9f7ec42c06c50c50d95a298e2b6623f20215cf SHA-256: f51b712abe3ad8bbbfb6641b773102d76008b12af24443342068f9c37fc465e5
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, identified as a link farm, pointing to websites offering game cheats and rewards. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic further suggests a deceptive user interaction. The primary attack pattern involves luring users to these external sites, which likely host further malicious content or facilitate phishing.

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/406889139/coin-master-free-spin-reward-links-game-hack
    • https://encounternepal.com/userfiles/files/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/mcpe-com_GM479516143.pdf
    • https://encounternepal.com/userfiles/files/coin-master-hack-apk_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/free-spin-coin-master-game_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/free-games-like-roblox_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/free-coin-master-coins-and-spins_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdf
    • https://encounternepal.com/userfiles/files/can-i-get-robux-for-free_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/best-free-minecraft-texture-packs_GM479516143.pdf
    • https://encounternepal.com/userfiles/files/free-robux-easy_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/coin-master-daily-free-spins-today_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/coin-master-hack-free-spins_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/robux-free-online_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/coin-master-hack-spin-link_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/tower-of-hell-roblox-hack_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/coin-master-blogspot-links_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a98.bin
629e95e6ae8cfa19b0f6d9f12deb5e97f86143397e100548973222c9cac35d11
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A98 24744 bytes
font_01_sfnt_off00008351.bin
b3a11fba1cb2f700afeb24321b2748de206350cd68cebaac90114e68d657d658
pdf-font-stream PDF embedded font (sfnt) at offset 0x8351 18396 bytes