Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af8f67693badefb…

MALICIOUS

PDF

46.0 KB Created: 2021-06-14 00:51:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f07f2e14155a3a6a52d1c355e7c652e6 SHA-1: ac69c94d4fc168f9890ee3ce44298d4b0d80d27b SHA-256: 4af8f67693badefb8ae0f1e2c736956f8101d77235b23f9cea774cb0c10c6f00
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm designed to attract users searching for game cheats and hacks. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be instructing users to provide a password for an archive, a common tactic to bypass security scans for encrypted malicious payloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/how-to-use-free-models-on-roblox-game-hack
    • https://new-era.com.tw/image/data/files/tiktok-like-bot-free_GM835599320.pdf
    • https://new-era.com.tw/image/data/files/coin-master-34-4-hack-download_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/roblox-gift-card-for-free_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/coin-master-mod-apk-free-download_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/how-to-get-free-robux-hack-on-a-tablet_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • http://new-era.com.tw/image/data/files/free-robux-working_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/coin-master-spin-hack-link_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/coin-spin_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/coin-master-promo-code-2021_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/coin-master-latest-mod-apk-free-download_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/free-roblox-wings_GM431946152.pdf
    • http://new-era.com.tw/image/data/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/free-coin-spin-coin-master_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/minecraft-xbox-360-free-download-code_GM479516143.pdf
    • https://new-era.com.tw/image/data/files/free-robux-pin-codes_GM431946152.pdf
    • http://new-era.com.tw/image/data/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/2021-no-human-verification-hack-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004813.bin
0ae9fe29429b4aab01abb1466b3d4604dc983e9f0170753bbf93ea8219f647c1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4813 25908 bytes
font_01_sfnt_off0000834e.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834E 3884 bytes
font_02_sfnt_off00008ff5.bin
02c064fe6ef3f2f889f2c5307201920131e787575a40bcef2e9ba8abf25cbf75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF5 18668 bytes

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