Malicious PDF — malware analysis report

Static analysis result for SHA-256 f998a51e488950ed…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 14:51:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 78f46e9d7e33b380e6fad33a97b983e2 SHA-1: 458cd453b2efc60ade359297491397ca579848db SHA-256: f998a51e488950ed5bb7c33f0a942d7da302dfb53a1e7887ec11dde29b5e2075
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering free in-game currency and hacks, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links, including a link farm heuristic, supports this. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

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.tw/app/431946152/microsoft-free-robux-game-hack
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/is-roblox-studio-free_GM431946152.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/april-fools-roblox-hacking-date_GM431946152.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-tiktok-free-followers_GM835599320.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/tiktok-free-edits_GM835599320.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hack-for-roblox-wont-get-banned_GM431946152.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-free-spins-link_GM406889139.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/robux-free-roblox-glitch_GM431946152.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-apk-mod-free-download_GM406889139.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-com-roblox_GM431946152.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/what-is-coin-master_GM406889139.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-can-i-get-robux_GM431946152.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/instant-free-spins-coin-master_GM406889139.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-gift-card-free-codes_GM431946152.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-hack-pastebin-2021_GM431946152.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-game-hunters-club_GM406889139.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-free-daily-spins-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fdd.bin
c2482673f249a3f5a96a70ad97a6e5e237f2924a56a52ad29e3517de7ad1c7ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDD 22208 bytes
font_01_sfnt_off0000612c.bin
eceba35cd6627b8fd8c95b6fc578f752ad37bdbc88f79a1a211c8d87d48b0e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612C 19136 bytes

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