Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f90579042652dd…

MALICIOUS

PDF

40.8 KB Created: 2021-05-17 09:39:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 24ca0dc6117240994919c20593d98531 SHA-1: 230ee6538ed04a906dd4a3161fbea2a51bcb8da0 SHA-256: 16f90579042652dddf41ababe0b95ef962d0b13978fcfa1232d6550121989679
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with SEO link farms. The document body and extracted URLs suggest a lure for game cheats and hacks, likely leading to malware downloads or phishing. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this assessment.

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-hack-pro-gamers-game-hack
    • https://www.similar.com.tw/upload/files/free-robux-cards_GM431946152.pdf
    • https://www.similar.com.tw/upload/files/minecraft-ore-finder-mod_GM479516143.pdf
    • https://www.similar.com.tw/upload/files/free-robux-stream_GM431946152.pdf
    • https://www.similar.com.tw/upload/files/roblox-hack-ios_GM431946152.pdf
    • https://www.similar.com.tw/upload/files/free-coins-for-flip-master-online_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/coin-master-daily-free-link_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/coin-master-game-hack-online_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/how-to-get-free-robux-without-paying_GM431946152.pdf
    • https://www.similar.com.tw/upload/files/how-to-get-free-skins-in-minecraft_GM479516143.pdf
    • https://www.similar.com.tw/upload/files/coin-master-free-spin-trick_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdf
    • https://www.similar.com.tw/upload/files/free-download-coin-master_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/coin-master-spin-hack-2021_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/hack-coin-master-using-cheat-engine_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/coin-master-apk-hack-mod-download_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/coin-master-free-rewards-link_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/how-to-get-free-coins-for-coin-master_GM406889139.pdf
    • https://www.similar.com.tw/upload/files/coin-master-links-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046db.bin
aa88471dfc0f1bb53919c3072cbd341eaadf88d8296eb92cb2811287dfcdd984
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46DB 24284 bytes
font_01_sfnt_off00007d5e.bin
7c3ba000fcc9e82367a9cf09e7428e48624a936725f215f3086fe1b405a0b7f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5E 18132 bytes