Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4fff61c87cefb4…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 11:49:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0c0bc827110b8f19498c882602feadb3 SHA-1: 5bdb1bfb1067888ca4bfb2618e50bfb791e69730 SHA-256: cf4fff61c87cefb4a4be5947436e43696996eae8a24e315bcf8ebcb1388d4dd8
102 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with game cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure reinforces the malicious intent. The primary goal appears to be directing users to external sites that likely host malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-card-collection-link-game-hack
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/roblox-someone-hacked-my-account-and-spent-robux_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-legitimately-get-free-robux_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-roblox-suit-shirt-templates_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/roblox-free-robux-2021-no-wait_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-robux-rapido_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-be-a-hacker-in-roblox-2021_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-minecraft-maps_GM479516143.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/roblox-gift-card-free-codes_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/no-scam-free-robux_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-get-free-tiktok-coins_GM835599320.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/is-minecraft-education-edition-free_GM479516143.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/roblox-jailbreak-fire-truck-hack_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-coin-master-app_GM406889139.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdf
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-robux-kindle-fire_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033a2.bin
2dc701adb3b26edadfbccc791ecec0cf3520ea20ae0d47ce3f26f19926ec86ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x33A2 22772 bytes
font_01_sfnt_off0000667a.bin
ffcdde65fbc11ac4564943f1b7ab4cc8ae2466c0ddb41cd48a89f042d41a65fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 18252 bytes