Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5bdea0e54ada77…

MALICIOUS

PDF

47.8 KB Created: 2021-06-09 15:33:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a7e97be2b6a19f22a6f30d474c774b40 SHA-1: 22b905cfe6191213035b82627daf4b01d659af19 SHA-256: 7b5bdea0e54ada77102894993ed584ff9cface982c43c9832c006a4d18376ed4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which appear to be part of an SEO link farm. The ML classifier also flagged this PDF as malicious. The presence of a download button lure suggests an attempt to trick the user into clicking these links. While no scripts were directly extracted, the structure and heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/apps-roblox-hacks-game-hack
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/free-spins-coin-master-links_GM406889139.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/roblox-unlimited-robux-hack-no-human-verification_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/free-minecraft-maps_GM479516143.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/how-to-get-any-gamepass-for-free-roblox_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/how-to-backdoor-hacking-roblox_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/get-free-spins-coin-master_GM406889139.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/how-to-get-free-items-from-games-roblox_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/is-minecraft-free-on-pc_GM479516143.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/free-robux-2021-real_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/free-robux-quiz_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/free-robux-hacks-new-2021_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/robux-hack-no-survey-no-verification-2021_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/minecraft-bedrock-edition-free_GM479516143.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/i-hacked-this-person-on-roblox_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/easy-robux-no-hack_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/script-musica-roblox-hack_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/free-robux-for-watching-ads_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/roblox-egghunt-2021-hack_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/free-roblox-gif-card-codes_GM431946152.pdf
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/roblox-april-fools-hack-wiki_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e0.bin
2debd04dd7332d2aaaa95e1910a6d234e23f6ce8b2a815f63f2089011890ad37		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E0 25372 bytes
font_01_sfnt_off00008dd8.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD8 2824 bytes
font_02_sfnt_off00009787.bin
41320a840987827104986dd97a779b5f161909797f07aed72d4563f8ccd6bbaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9787 18356 bytes

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