Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfad2b883206ea0…

MALICIOUS

PDF

48.1 KB Created: 2021-06-11 06:23:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 23e2a60d5fd4582395ed4ef84690f089 SHA-1: ca9ca8d4c40364f0ad116dc125f72beefb8eda0f SHA-256: ccfad2b883206ea0851757f5a754977035b1decfc5e3706a0e4f38ccdf747491
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, presented as a link farm, and displays a fake CAPTCHA to trick users into interacting with it. The primary URL, 'https://netcdn.tw/app/431946152/free-robux-and-limiteds-roblox-game-hack', suggests a lure for free Robux, a common social engineering tactic. The presence of embedded JavaScript, though not directly analyzed for specific actions, combined with the fake CAPTCHA and link farm, indicates an attempt to drive users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 5

  • 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
  • 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/free-robux-and-limiteds-roblox-game-hack PDF link annotation
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-a-phone-easy_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/if-you-have-builders-club-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-stuff-on-roblox-catalog-on-phone_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-a-computer_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-pants-not-by-roblox-free_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/como-tener-wall-hacks-en-roblox_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-100-legit_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-hack-roblox-high-school-money_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-hack-cunter-blox_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-hack-in-ar-in-roblox_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-be-a-creeper-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-any-roblox-shirt-for-free_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/is-there-a-free-coding-platform-for-roblox_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-password-2021_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/hacks-for-booga-booga-roblox-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55AB 30176 bytes
SHA-256: dee191de78cbcc65e52c55c89ba03278e5225a53053a181b2bbeadfa705da356
font_01_sfnt_off0000985b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x985B 18748 bytes
SHA-256: a3b12ef1c6487c7059ac9e6edbc8931e6fcdd3215180a93daa9b877978061182

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