Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ba7dd27d2b3e8a…

MALICIOUS

PDF

49.6 KB Created: 2021-05-15 16:59:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f3a221d68051523d0aec40baada936bd SHA-1: 2eb3b411432615a65cf5366102b43a29b1c7ac40 SHA-256: f7ba7dd27d2b3e8af2259f400f580da576295c0f710ad43f46bcfd20bc112204
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also features a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO manipulation tactic. The primary URL extracted, 'https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-downloading-apps-game-hack', is likely the intended destination for users who fall for the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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.xyz/app/431946152/how-to-get-free-robux-without-downloading-apps-game-hack PDF link annotation
    • https://www.metal.hr/files/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/blox-best-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/claim-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/minecraft_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/robux-match_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A78 28148 bytes
SHA-256: a52bc7ee6f2928a1cf433ba13becd7a70733bde774e0e4ab2fadc6d9f7c0b9b8
font_01_sfnt_off00008deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEB 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AFD 19876 bytes
SHA-256: 8da7f6a753952615a486eb6a0fdfe7794e2ad045808eb185ac8c0a25e8999c49

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