Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36fdbc981dcdbf6…

MALICIOUS

PDF

33.5 KB Created: 2021-06-19 03:42:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 76ff614f2c711726b6da02253e2be1fc SHA-1: aa3a52e7c6e5781b203ec3b76c7eb260a3a54dfc SHA-256: f36fdbc981dcdbf69dfdff5170f1aad153aced2352673f344d7d76fa09696a49
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to sites offering 'free Robux' or game hacks, suggesting a lure for potentially unwanted or malicious downloads. The presence of a 'download button' heuristic further supports this. The ML classifier also strongly indicated maliciousness.

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/app-hack-robux-game-hack PDF link annotation
    • http://pustaka.fkg.unand.ac.id/repository/free-roblox-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-can-you-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-wifi-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/real-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-the-kistune-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-explorer-up-on-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-synapse-free-download-2021-feb_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/get-roblox-synapsex-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-gift-card-codes-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/best-roblox-games-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-hack-codes-for-robux_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_off00002c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C5B 22428 bytes
SHA-256: f4f771de82799400ad63ffdd3501327bdb59507f7c447f3e7aeefe9a31533c7c
font_01_sfnt_off00005e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E46 18896 bytes
SHA-256: 4de83a052c37bdd5fe0352df9e64d57a5163f8fad70e5890d106d6223a88c758

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