Malicious PDF — malware analysis report

Static analysis result for SHA-256 942afc7d26e98251…

MALICIOUS

PDF

46.2 KB Created: 2021-06-08 12:30:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f861e0ee4bb2e87f93e48a0449e11a49 SHA-1: 5a1440269179e927fa29a2330df8a41326ef5766 SHA-256: 942afc7d26e98251bc5b02049ad0696f56e17a8f75977e9db0e33ea8ecb0d461
102 Risk Score

Malware Insights

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

The sample was classified as malicious by an ML model and exhibits characteristics of a fake CAPTCHA lure, designed to trick users into interacting with the document. It contains numerous embedded URLs, including one pointing to a suspicious domain, which likely serve as the next stage of the attack, potentially leading to malware downloads or phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 5

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/431946152/1x1x1x1x1-roblox-hacker-game-hack
    • http://elektrofahrspass.de/images/roblox-free-hats_GM431946152.pdf
    • http://elektrofahrspass.de/images/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://elektrofahrspass.de/images/free-coin-master-game_GM406889139.pdf
    • http://elektrofahrspass.de/images/minecraft-free-ios-2021_GM479516143.pdf
    • http://elektrofahrspass.de/images/free-roblox-accounts-2021-bugmenot_GM431946152.pdf
    • http://elektrofahrspass.de/images/robuxy-com-free-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/roblox-skin-free_GM431946152.pdf
    • http://elektrofahrspass.de/images/free-robux-with-download_GM431946152.pdf
    • http://elektrofahrspass.de/images/robux-hack-generator_GM431946152.pdf
    • http://elektrofahrspass.de/images/roblox-pink-free-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/free-robux-for-roblox-no-human-verification-or-survey_GM431946152.pdf
    • http://elektrofahrspass.de/images/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://elektrofahrspass.de/images/how-to-get-free-robux-no-scam_GM431946152.pdf
    • http://elektrofahrspass.de/images/roblox-help-free-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/minecraft-pocket-edition-free-download_GM479516143.pdf
    • http://elektrofahrspass.de/images/roblox-com-free-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/how-to-get-free-robux-on-computer_GM431946152.pdf
    • http://elektrofahrspass.de/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://elektrofahrspass.de/images/minecraft-toolbox-premium-apk_GM479516143.pdf
    • http://elektrofahrspass.de/images/coin-master-free-attack_GM406889139.pdf
    • https://collectrobux.co
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f1b.bin
f23c0b44f6466b69168f1509172939bffd11fcd3587a0e2b699555c5bcf3e52e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F1B 24616 bytes
font_01_sfnt_off000087b8.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B8 2824 bytes
font_02_sfnt_off00009167.bin
9b168c1d873c08550f3cf22f04ffa9b426cea87128e2b3e4d1bcddb748332d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9167 18288 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.