Malicious PDF — malware analysis report

Static analysis result for SHA-256 5276c14b503683a6…

MALICIOUS

PDF

39.9 KB Created: 2021-05-23 03:37:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c7eed6613794e2de86f3aed6f080fc5b SHA-1: 5184bfca78a20c7953289617749f6d0b923ba986 SHA-256: 5276c14b503683a6b60e23e5a2f515deed4f492437fa285d9f9962cebb018e3d
122 Risk Score

Malware Insights

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

The PDF document employs social engineering tactics, presenting a fake CAPTCHA and download lure to trick users into clicking malicious links. The embedded URLs point to sites offering 'free' services, a common lure for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction, likely leading to the download of a second-stage payload or redirection to a credential-harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/free-tiktok-likes-no-human-verification-or-downloading-apps-game-hack PDF link annotation
    • http://famoirs.co.uk/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://famoirs.co.uk/images/tiktok-free-download-video_GM835599320.pdfIn PDF document text
    • http://famoirs.co.uk/images/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://famoirs.co.uk/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://famoirs.co.uk/images/free-roblox-hair-codes_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_002_off000031a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31A5 25948 bytes
SHA-256: 864355c6835fe948eacfb6ea3f1b89037b445ac6741703759c1fd1382a3225dc
font_01_sfnt_off00006d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2E 3000 bytes
SHA-256: 56ee3cf210babcab1d595ec3cc7d666f7a646b8ea00ab1e6563ebd84f84582f8
font_02_sfnt_off0000778d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778D 19260 bytes
SHA-256: 26817b4cedfa85687dbcd5cd5fe0b6768af480ef1d18351329c732120202e544

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