Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf419d02afd749f7…

MALICIOUS

PDF

34.4 KB Created: 2021-06-22 11:20:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4fcfaed6111caf6fef623d37e1a28a0d SHA-1: 6ad74da4f19f9ce3c7ff667bf8417a370371beb0 SHA-256: bf419d02afd749f734d8cfc4aca8404de9724dfa8daff8ee7a309af9c214c282
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO link farms promising free Robux or game cheats. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a 'download button' lure suggests a phishing or scamming attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.co/app/431946152/how-to-get-free-robux-website-game-hack PDF link annotation
    • http://www.harveenent.com/uploaded_files/userfiles/files/free-robux-card-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/roblox-lua-cheat-sheet_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-2021-for-kids_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/robux-money_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/how-to-get-free-robux-youtube_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
font_00_sfnt_off00002fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDB 22140 bytes
SHA-256: 4cf0d4c2cf6c27fdeb03651b54ac49ea42be58e108aca7e1dc9ffa846e6694fc
font_01_sfnt_off00006097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6097 19304 bytes
SHA-256: c93debd830b422eae21ec10a608c2d09d6fed7207bb4c45cee900aa0b721bbbd

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