Malicious PDF — malware analysis report

Static analysis result for SHA-256 161ace344a40666b…

MALICIOUS

PDF

45.9 KB Created: 2021-05-15 02:03:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 00e51bfeb641e1db6518d6bd9d723636 SHA-1: dc6edb5ddcbf56318d5d5043b1c915b5beadca7d SHA-256: 161ace344a40666b5dc5046ae7a7ebd75394392c724d815d3283634b7b639c1c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external websites. The document body, though partially corrupted, suggests a lure related to 'free coin master links' and 'free robux', indicating a potential scam or phishing attempt. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of the file. No scripts were extracted, but the presence of external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/406889139/free-coin-master-links-game-hack
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/easy-robux-today-com_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-spins-free-2021_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-robux-generator-without-human-verification_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-robux-real-2021_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-admin-free-spins_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/25-free-spins-coin-master_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/games-that-give-free-robux_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-robux-without-human-verification_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/minecraft-servers-that-allow-hacks_GM479516143.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-coin-master-spin-and-coin-link_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-card-collection-hack-2021_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-get-unlimited-robux_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c5a.bin
8780bc07137124865bd49c43d060d486ed8423cd841885c279864d1e139cb540		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C5A 26124 bytes
font_01_sfnt_off00008845.bin
c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8845 2896 bytes
font_02_sfnt_off0000922b.bin
dfe41e252eeea42f6a4072e9595d4435e06b86b6ad2d398cb4b971b8bcb02477		 pdf-font-stream PDF embedded font (sfnt) at offset 0x922B 17880 bytes

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