Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dc9b34a7069c97…

MALICIOUS

PDF

48.1 KB Created: 2021-06-10 11:27:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3877634822a7b73c7bb8f83eb51c4d9c SHA-1: 96527266482dd91b619ea532438e2a2fa2e72bb4 SHA-256: 28dc9b34a7069c97032b97ebfb91fb30beacc540204e320ca02883b1d2f71d75
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links to websites that promise free game-related items, such as Robux. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users with deceptive offers. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these links and the nature of the lures strongly indicate a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.tw/app/431946152/free-robux-website-no-password-game-hack
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-coin-master-spins-blog_GM406889139.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/roblox-hacks-and-cheats_GM431946152.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-spins-coin-master-app_GM406889139.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/what-is-coin-master-app_GM406889139.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-robux-generator-no-survey_GM431946152.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/minecraft-hack-2021_GM479516143.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/coin-master-spin-link-free_GM406889139.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/card-hack-for-coin-master_GM406889139.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/roblox-data-breach_GM431946152.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-tiktok-engagement-calculator_GM835599320.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/minecraft-games-free-to-play-online_GM479516143.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-apk-mods-coin-master_GM406889139.pdf
    • http://www.alajwakh.com/uploaded_files/userfiles/files/fbchampion_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054a9.bin
e52af99f403e91df137d3844e16bcf6579eaeb35c0c9645c79aea2c0ca02338f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54A9 28488 bytes
font_01_sfnt_off0000971a.bin
732ff2d4dfb493cc7cb888103424aad6c819cf48138280902073aeb673d4b7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x971A 19156 bytes

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