Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8596bf30b476c3…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 05:10:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: af99bda94c3b9d042a167036accc01fa SHA-1: 85e0732b867ee9071d2c4e23a250f5d9bba5015f SHA-256: 1a8596bf30b476c31cab5ce684630cd94bb542c39b59278cb29f96c3aa0c419f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files promising game hacks and cheats. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a link farm suggests an attempt to redirect users to malicious content or downloads. The document's content and structure are consistent with a phishing or scam attempt to distribute potentially unwanted or malicious applications.

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-hack-pro-gamers-game-hack
    • http://www.valenciamaids.com/userfiles/files/latest-coin-master-free-spins-link_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdf
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-attack_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/free-robux-hacker-us_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/roblox-how-to-walk-through-walls-hack_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdf
    • http://www.valenciamaids.com/userfiles/files/free-printable-roblox-coloring-pages_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/free-robux-discord_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/roblox-earn-robux_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/roblox-games-with-free-radio_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/roblox-hack-download_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/robux-earning-websites_GM431946152.pdf
    • http://www.valenciamaids.com/userfiles/files/hack-coin-master-free-spins_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-spins-2021_GM406889139.pdf
    • http://www.valenciamaids.com/userfiles/files/game-hunters-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003233.bin
bdbe89e3adad9091a6482575ae33013b414c3495f24363bd98121acc0e2d1ff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x3233 22800 bytes
font_01_sfnt_off00006560.bin
42eb204123647df6f85ca188dd99f1d84b9bafa3d0fb5c7709fcc50fb0944608
pdf-font-stream PDF embedded font (sfnt) at offset 0x6560 18416 bytes