Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7925bdfa5b0f4f…

MALICIOUS

PDF

44.9 KB Created: 2021-05-12 01:29:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2a74f5e606e817b14f5d5f5ae4ef02af SHA-1: aa1e8513b3fb65dcc73efe01797b0ac97e3cebc4 SHA-256: cb7925bdfa5b0f4f7ad29000249b2b7d694b68e4c5937bfa0c150a91b8a45c8c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which are disguised as 'Robux Generator' or 'Coin Master Free Spins' lures. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to direct users to potentially harmful content or exploit kits. No scripts were extracted, but the overall structure and content indicate a phishing or scam attempt.

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 https://netcdn.xyz/app/431946152/roblox-robux-generator-http-freerobuxgenerator-xyz-game-hack
    • http://www.valenciamaids.com/userfiles/files/scary-larry-roblox_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/free-robux-with-no-verification-2021_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/robux-giver_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/how-to-get-20210-robux-for-free_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/como-hackear-coin-master-ios_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/hackear-juego-coin-master-espaol_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/earn-robux-websites_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/coin-master-village-3_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/coin-master-claim-free-spins_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/download-coin-master-apk-hack_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/rbxcity-free-robux_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-2021-app-download_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-link-today-new_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/how-do-you-get-free-robux_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/www-robux-us_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e9e.bin
0858ab0a6546c22fb35f062f0a92c7a3923586d9cbe362dd79d479ae1d1daa01
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9E 25792 bytes
font_01_sfnt_off00008a98.bin
ca12ce3d7dfc1e8f594ff16b8d50f9174b7c57a2d485e52127105fd2973060c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A98 19148 bytes