Malicious PDF — malware analysis report

Static analysis result for SHA-256 51259e74858b7d04…

MALICIOUS

PDF

45.0 KB Created: 2021-06-07 02:08:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4ee5e1ed899952ec90ad31d3ee7022b2 SHA-1: 56a154b67d8cc214d669220ad0582b8cffc103c6 SHA-256: 51259e74858b7d04755f54646a8893fef3faa37a8f5b15e7014380edf6b9d56c
122 Risk Score

Malware Insights

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

The PDF document impersonates Facebook and presents a fake CAPTCHA to trick users into clicking a malicious link. The link leads to a resource hosted on netcdn.tw, which is likely intended to deliver a second-stage payload or phish for credentials. The ML classifier strongly flagged this PDF as malicious, supporting the observed social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/hack-day-z-2-roblox-game-hack.
  • 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/hack-day-z-2-roblox-game-hack PDF link annotation
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/get-free-hero-animation-roblox_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/i-want-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/pastebin-free-robux-hack-no-wait_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/free-robux-2021-july_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/how-to-get-free-robux-2021-not-patched-read-desc_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/roblox-tower-defense-hacks_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/free-roblox-dont-need-any-robux_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/roblox-hack-facebook_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/roblox-free-gamepass-v3rmillion_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/how-to-hack-into-builders-club-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/cool-roblox-costumes-free_GM431946152.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://www.imparadigitale.it/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-mobile_GM479516143.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_off00005387.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5387 24672 bytes
SHA-256: dd65646eabea752cc37b9759935d8c8892a8f8b6505040b0560162e2a2778222
font_01_sfnt_off00008b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B90 18748 bytes
SHA-256: eeabe6753d06e2c343277e2ad6759b864559fb4e19ce2b8c38cbcc9313f9af4b

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