Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6540870cd2e84cd…

MALICIOUS

PDF

44.7 KB Created: 2021-06-08 16:43:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b769254b45e8fb9639452dfcafc91600 SHA-1: ac91636a630d180e3a51e194cfc771166e5c384a SHA-256: f6540870cd2e84cd161fb2919182bd8cb7f050e85b314601fc87b89f1b38ae3f
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick users into clicking malicious links, such as the one pointing to 'https://netcdn.tw/app/431946152/how-to-get-free-robux-on-a-samsung-tablet-game-hack'. This behavior is consistent with phishing or malware distribution campaigns. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit user interaction for malicious purposes, likely leading to a second-stage download or redirection to a scam site.

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/how-to-get-free-robux-on-a-samsung-tablet-game-hack PDF link annotation
    • http://ff-obertraun.at/images/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/youtube-free-robux-obby_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/best-app-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/roblox-hacked-version-download_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_off000050b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B8 24584 bytes
SHA-256: 5d5890bc41df11332404c7976fdf3e3ecfeecb8e410359b857ceabb30135b26f
font_01_sfnt_off00008956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8956 19132 bytes
SHA-256: 0029d54081913e4bd942a19ad2e56bb7c5b1fef60eb5e9a01771857d9e98c8d7

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