Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b50f4889bc20859…

MALICIOUS

PDF

44.8 KB Created: 2021-06-10 17:59:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8965a7923348d752d2c76c3520d43642 SHA-1: 621adf8e87f75d296908a30592f1a276356fc30a SHA-256: 4b50f4889bc20859855856b24189ce91bde8f8557534060353f27beaf3e4dac0
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with a malicious link, likely to download a second-stage payload. The presence of multiple URLs related to game hacks and the ML classifier's high confidence score support this assessment. No scripts were extracted, limiting further analysis of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/fnaf-rolelay-roblox-money-hack-game-hack
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-free-robux-100-working-secret-method_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-do-you-get-hacks-on-roblox_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/bloxpink-free-robux_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-redeem-codes_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/ash-greninja-free-shopping-in-roblox-on-roblox-shopping-shir_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/download-roblox-android-free_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-app-without-human-verification_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/hack-para-roblox-dansploit_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-download-hacks-in-roblox-high-school_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/minecraft-java-edition-code-free_GM479516143.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/google-roblox-free-hats_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-script-pastebin-2021_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/hack-tool-roblox-2021_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-run-roblox-hacks-on-school-pc_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/bird-simulator-hack-roblox_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-obby_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/fencing-roblox-hacks_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-free-quirks-in-boku-no-roblox_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/roblox-hack-bee-swarm-simulator-2021-download_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-v-bucks-etc_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f55.bin
9a555929af21cab50907432a12ff01d39f86fff2360ade7dd8b53ead0765737c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F55 26936 bytes
font_01_sfnt_off00008b35.bin
af7f6b8f93628cdd4f4aa4b6399161473e3a07cfb75dab11949fae83792c870a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B35 18720 bytes