Malicious PDF — malware analysis report

Static analysis result for SHA-256 a578931fe1d604bf…

MALICIOUS

PDF

48.8 KB Created: 2021-06-09 02:53:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7b35d9b06bef9d28ed7e9bf69c2b5000 SHA-1: a5d01ccfc0bd44768666a28e1ca9cbf81d05f635 SHA-256: a578931fe1d604bf3955e6158a57020f44a59027e1aef818e45c392b4cb64be7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs that point to websites offering game hacks and generators, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic indicates a pattern of SEO abuse for malicious purposes. The document body, though partially corrupted, contains references to game hacks and download links, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/beautiful-hair-roblox-free-game-hack
    • https://library.institutpendidikan.ac.id/repository/coin-master-game-hack-app-download_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/uprobuxcom-free-robux_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/coinmaster_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/robux-generator-without-human-verification-2021_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/free-spin-in-coin-master_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/online-coin-master-hack-here_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdf
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-100-spin-link_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/roblox-tracker_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/free-free-robux_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/win-free-robux_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/minecraft-clipart-free_GM479516143.pdf
    • https://library.institutpendidikan.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052d9.bin
1927122129e3e26b36204fd10e1ee774d5d7eb42236a5498617e24df509787a5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D9 26636 bytes
font_01_sfnt_off00009181.bin
972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9181 2820 bytes
font_02_sfnt_off00009b21.bin
3af199d4285d38e4fc38a1c085ec0a7c2468e332d6809e89f27b283c700b6ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B21 18540 bytes

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