Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a9efa84fbc3052…

MALICIOUS

PDF

34.5 KB Created: 2021-06-19 06:26:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 82e698abf76749cccb4e5cc0457912e8 SHA-1: bf7e9a1285253117680ef80bc79eb0f277faa224 SHA-256: 29a9efa84fbc305212d34dffc187d5f7e7d29eabbb686d575de1d7c3113c0bc6
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a link farm heuristic, indicating an attempt to redirect users to external, potentially malicious content. The document body and heuristics suggest a lure related to game cheats ('free Robux', 'free spins') to entice users to click on these links, which likely lead to further malware downloads or phishing pages. The ML classifier strongly supports the malicious verdict.

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/free-robux-birthday-glitch-game-hack PDF link annotation
    • http://berntfoto.dk/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/oginject-co_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-hack-a-site-to-give-you-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/tiktok-free-package_GM835599320.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-robux-on-roblox-2021-ipad_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-stuff-from-the-catalog-on-roblox_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-robux-reedem-code_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-duffel-bag-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/wearedevs-roblox-exploits-and-hacks_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-scratchy-youtube-how-to-get-free-games_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_off00002f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2A 22428 bytes
SHA-256: bd2b6d9088e8f615cb88de481aae21c0ac3a1e26bb019694f57a19a67efd5b7b
font_01_sfnt_off00006126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6126 19348 bytes
SHA-256: b519408df6f764bce7ed64c660f3e3cba35d62bdae857d1994f9ce6c56fe1ba2

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