Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7aca27dcbd3799…

MALICIOUS

PDF

43.4 KB Created: 2021-05-19 22:30:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7ede1342c8be9cbaffb14b6166909a58 SHA-1: d67cc399a8ca806afc79cda7fcd7ffbcbcc32d77 SHA-256: ba7aca27dcbd3799c84c135a4fa8f369e8b412604d4253e1bceab659ed41d635
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are structured as SEO-optimized PDF filenames, suggesting a link farm designed to drive traffic to potentially malicious sites. The document body, though partially corrupted, contains a URL related to a 'tiktok-free-internet-game-hack', reinforcing the lure of free in-game items. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/835599320/tiktok-free-internet-game-hack
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/free-robux-codes-generator-no-verification_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/free-coins-on-coin-master-generator_GM406889139.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/coin-master-free-spins-link-iphone_GM406889139.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/roblox-booga-booga-hack_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/coin-master-free-spins-link-today_GM406889139.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/how-do-you-get-roblox-for-free_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/robux-no-survey_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/show-me-how-to-get-free-robux_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/robux-website_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/minecraft-clipart-free_GM479516143.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/roblox-exploit-download_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/how-to-get-free-robux-without-surveys_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/coin-master-free-coins-and-spins_GM406889139.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdf
    • https://elearningmtsn33jkt.net/__statics/gudangsoal/files/best-way-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004964.bin
13f105b758cb208e8508b38a647e9a155c88ec8b515884cb9f97629070f469e2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4964 23496 bytes
font_01_sfnt_off00007eb4.bin
d6dd29adb69da7f9a23a5e3791282a61e2f811794f560a0c409c8747766d9102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB4 3124 bytes
font_02_sfnt_off0000896d.bin
e1180284eee3723d23cfb000db92ce7be0c25e9ce3ceeece85a659fec16dee9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x896D 17456 bytes

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