Malicious PDF — malware analysis report

Static analysis result for SHA-256 5faf7517e6b132ac…

MALICIOUS

PDF

50.0 KB Created: 2021-06-09 06:23:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 749f541a7dba8cdf286acd42b983f220 SHA-1: 5901982f2906353b65e749b9cdd71195ddbe0695 SHA-256: 5faf7517e6b132ac72a5cd14ec81be1786674371cef447e2065713b3fee6b595
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to trick users into interacting with it, likely to initiate a download. The embedded URL points to a resource that claims to offer free Robux, a common lure for gaming-related scams. While no scripts were directly extracted, the PDF structure and heuristics suggest it may exploit PDF vulnerabilities or embed JavaScript to redirect the user to the malicious URL, which could then serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-by-watching-ads-2021-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-wall-hack-2021_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-free-skin_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/oginject-co_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/tiktok-free-movie-website_GM835599320.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-group-free-robux_GM431946152.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_004_off000053a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A5 26884 bytes
SHA-256: 13c9d179555f444921853ab3c965519ea0098a7902d3eda604e6b39245d90b2e
font_01_sfnt_off000091ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91AC 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off00009b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B63 20036 bytes
SHA-256: a62cd567aaf5bcbe907b45931587b72a4385775180aedf059baac38a7b4b34d9

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