Malicious PDF — malware analysis report

Static analysis result for SHA-256 778b6a35bffac36b…

MALICIOUS

PDF

54.6 KB Created: 2021-05-19 15:07:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8d939e0d1ec0b3285e7276b81acfe3d9 SHA-1: c8a7c0bc578b57e8ef00ae9df47ab5c3e8b3a48b SHA-256: 778b6a35bffac36b3fd88310cb3a9da6a989803702732d04650b7f8560564f7f
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with it, which is a common lure for phishing or malware distribution. It contains multiple embedded URLs, including one pointing to a 'coin-master-hack' page, suggesting a scam or credential harvesting attempt. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8569

Heuristics 4

  • 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
  • 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/406889139/coin-master-hack-twitter-game-hack
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • http://aeridefense.com/image/data/files/free-coins-coin-master-blog_GM406889139.pdf
    • http://aeridefense.com/image/data/files/pubg-uc-2-all-pro_GM1330123889.pdf
    • http://aeridefense.com/image/data/files/robux-free-gift-card_GM431946152.pdf
    • http://aeridefense.com/image/data/files/roblox-cheat_GM431946152.pdf
    • http://aeridefense.com/image/data/files/roblox-trolling_GM431946152.pdf
    • http://aeridefense.com/image/data/files/tiktok-free-fans-and-followers_GM835599320.pdf
    • http://aeridefense.com/image/data/files/websites-that-give-you-free-robux_GM431946152.pdf
    • http://aeridefense.com/image/data/files/coin-master-spin-link-today-2021_GM406889139.pdf
    • http://aeridefense.com/image/data/files/coin-master-link-app_GM406889139.pdf
    • http://aeridefense.com/image/data/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • http://aeridefense.com/image/data/files/coin-master-unlimited-spins_GM406889139.pdf
    • http://aeridefense.com/image/data/files/roblox-free-rubox_GM431946152.pdf
    • http://aeridefense.com/image/data/files/give-free-robux_GM431946152.pdf
    • http://aeridefense.com/image/data/files/free-robux-no-gift-card_GM431946152.pdf
    • http://aeridefense.com/image/data/files/free-robux-hack-us_GM431946152.pdf
    • http://aeridefense.com/image/data/files/free-games-coin-master_GM406889139.pdf
    • http://aeridefense.com/image/data/files/coin-master-free-spins-no-survey_GM406889139.pdf
    • http://aeridefense.com/image/data/files/roblox-person_GM431946152.pdf
    • http://aeridefense.com/image/data/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ace.bin
dd44c4d2c55c7e1942589658332a80612b797f83f9eb9759df604c54cb8af456		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ACE 25984 bytes
font_01_sfnt_off00008764.bin
e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8764 3088 bytes
font_02_sfnt_off0000922f.bin
cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x922F 7960 bytes
font_03_sfnt_off0000a554.bin
91c2be8de5132e4c01efff6048559585f8cc3e87dd90bf946d8d6b14de046cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA554 17880 bytes
font_04_sfnt_off0000c63a.bin
fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC63A 4272 bytes

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