Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b63ea173e94d590…

MALICIOUS

PDF

48.8 KB Created: 2021-06-08 18:49:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 51f77be4dcb0b04691ab5a26a7dd4434 SHA-1: 6b247dcaace6001f98c835a1e5906b3b0563026e SHA-256: 2b63ea173e94d590f78d1c5b4433d83cfcd0593d023270f77125ff45c2fc64e5
182 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking embedded links, which is a common tactic for delivering malware. The document also exhibits characteristics of a link farm, with numerous URLs pointing to potentially malicious content. The presence of a password archive lure suggests an attempt to bypass security controls by encrypting the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/youtube-roblox-lumber-tycoon-hack-cheat-engine-game-hack
    • https://allpromise.com.tw/image/data/files/moonactive-coin-master_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/get-free-spins-on-coin-master_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/free-coin-master-spin-generator_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/free-minecraft-hosting-24-7_GM479516143.pdf
    • https://allpromise.com.tw/image/data/files/robux-websites-2021_GM431946152.pdf
    • https://allpromise.com.tw/image/data/files/master-free-spin-and-coin-link_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://allpromise.com.tw/image/data/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • https://allpromise.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/coin-master-free-spins-no-human-verification_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/robux-page_GM431946152.pdf
    • https://allpromise.com.tw/image/data/files/coin-master-free-link-today_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/how-to-get-free-followers-and-likes-on-tiktok_GM835599320.pdf
    • https://allpromise.com.tw/image/data/files/free-robux-hack-us_GM431946152.pdf
    • https://allpromise.com.tw/image/data/files/coin-master-hacks-and-cheats_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/free-spins-coin-master-android_GM406889139.pdf
    • https://allpromise.com.tw/image/data/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • https://allpromise.com.tw/image/data/files/is-minecraft-free-on-mac_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005155.bin
b4757621100dfec97726d327df87b48a6c282b35a6b264be37f17d229121add9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5155 25116 bytes
font_01_sfnt_off00008b3b.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3B 5696 bytes
font_02_sfnt_off0000984d.bin
ee79b8a6715a5824ac4a6155bc0fa6da4dcb40ead7f16675bea1b9fc98759bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x984D 19604 bytes

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