Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe36b3b41ba4828…

MALICIOUS

PDF

35.6 KB Created: 2021-07-09 04:50:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a45908d81e86c78d08a431646117b2e8 SHA-1: 909ee4a56d9480587881e7d7a07aa624816932eb SHA-256: ebe36b3b41ba48283237dbab307ad7f04d1bea76cd50b7e4f25d7220e7b14fe1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, identified as a PDF link farm, pointing to sites offering free in-game currency and hacks. The primary URL, http://netcdn.tw/app/406889139/free-daily-spins-coin-master-game-hack, is likely a lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-daily-spins-coin-master-game-hack PDF link annotation
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-make-robux-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/400-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/roblox-virus-free-hack-clients_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/gold-cards-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/code-for-free-pet-bubblegum-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/youtube-how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/is-hacking-robux-impossible_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-fedora-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003288.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3288 23388 bytes
SHA-256: 862a8e68043f4e3c4c2b2feff7f2d05b1cb22c68af291284fb41cf62447e31ed
font_01_sfnt_off00006796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6796 18596 bytes
SHA-256: 4ad8fd882529be3d23a027a1092be38fd3a881cb86878c09c64331b24aa9a906

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