Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5706261e0bbb3f…

MALICIOUS

PDF

35.9 KB Created: 2021-07-06 12:31:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 68094e96caa19c6e5b7c776c7130dfb7 SHA-1: 404f498377fa435466492361a12c7f4419fae958 SHA-256: bd5706261e0bbb3fdd6ee60b35020eaa6544fa882433bc92721f467c181cbec7
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a "download button" lure, strongly suggesting it is designed to trick users into downloading further malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves social engineering users with promises of free in-game items or hacks, leading them to external sites that likely host malware.

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/431946152/free-roblox-account-v3rmillion-game-hack PDF link annotation
    • http://new-era.com.tw/image/data/files/no-virus-hack-roblox_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/roblox-gamma-hack_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/can-u-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/vip-area-for-free-in-roblox-texting-simulator_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/when-does-john-doe-hack-roblox_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-draw-roblox-hack_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-roblox-animations_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/2021-roblox_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
font_00_sfnt_off0000337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x337E 22748 bytes
SHA-256: b8954069a050da51f5ff064333af362f4396d2d3aa01ce11294748a1f3777da2
font_01_sfnt_off0000669e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669E 19396 bytes
SHA-256: b909aed15544ef4c9199df393961966d4ed4d67ce1658fee6787fc956b603279

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