Malicious PDF — malware analysis report

Static analysis result for SHA-256 489558e2414553ef…

MALICIOUS

PDF

45.6 KB Created: 2021-06-09 17:24:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d0b66d1ac01358eeabf488bc10b87080 SHA-1: 7ea6997f1944169811e6585832ce7388195671e3 SHA-256: 489558e2414553ef73a38d64278932fd30b00172097d0a818c719794b3721d60
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to sites offering game-related hacks and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users with promises of in-game advantages. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is part of a scam or phishing operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/roblox-free-account-biz-game-hack
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/get-gold-coin-master-village-hack_GM406889139.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/blox-rewards_GM431946152.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/minecraft-hack-app_GM479516143.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/daily-free-spins-coin-master_GM406889139.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/pig-master-free-spins-and-coins_GM406889139.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-roblox-hack-us_GM431946152.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-spin-coin-master-2021_GM406889139.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/can-i-get-robux-for-free_GM431946152.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-spins-coins-coin-master_GM406889139.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-hack-no-survey_GM406889139.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-hack-tool-v1-9-apk_GM406889139.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-can-u-get-free-robux_GM431946152.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/minecraft-education-edition-free_GM479516143.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/roblox-moderators_GM431946152.pdf
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-robux-gift-card-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054c9.bin
50d516b86ee551de0050bcb5e29d3db5f54d53c50d724d69c9a735cc90b9f694		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54C9 25564 bytes
font_01_sfnt_off00008f52.bin
6439377ca72109f5b374509c4f08f18c3003e57d0ca10d5374456fa8bc3b446e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F52 18392 bytes

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