Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6e0ab5f7682e49…

MALICIOUS

PDF

48.5 KB Created: 2021-06-11 12:12:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f1e9aea85b0d957507e5ead2de4abb92 SHA-1: 14991a394f30f9db98db26a381aefee7c7d19fbf SHA-256: bb6e0ab5f7682e496ee96d60e31a5c8c68804b226be7545e5e83e5f5fec689c9
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, pointing to various game-related topics. The primary URL, https://netcdn.tw/app/431946152/how-to-speed-hack-roblox-mac-game-hack, suggests a lure for users seeking cheats or hacks. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/how-to-speed-hack-roblox-mac-game-hack PDF link annotation
    • http://dismarinamt.com.br/images/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-builders-club-accounts-on-roblox_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/roblox-shirt-white-free_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/hacking-poeple-in-roblox_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-egg-roblox_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/robux-game_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000515b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x515B 27304 bytes
SHA-256: 7d7e521b7fced35a6d21fdce2dd9a0588e38ea9d42d532a03cbfd5323069d608
font_01_sfnt_off00008f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F42 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00009904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9904 18892 bytes
SHA-256: de0bb089e577123de5173e015debadc1f876822ae93f263b255cd6349f01543c

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