Malicious PDF — malware analysis report

Static analysis result for SHA-256 432192aab4ad3cb8…

MALICIOUS

PDF

49.6 KB Created: 2021-05-19 06:19:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 05d28ca8b045bc7c6ce1db53b9ec4088 SHA-1: da9e512f0f5450cfdb5aa8f9def20d3a4ca7c606 SHA-256: 432192aab4ad3cb87420598be8f768213be9c913d148f81fed70c23409bb360d
82 Risk Score

Malware Insights

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

The PDF document contains a lure impersonating Microsoft, directing users to download a file from a suspicious URL. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests the document is designed to facilitate the download of a second-stage payload. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

Heuristics 4

  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/1330123889/pubg-uc-and-bp-free-game-hack.
  • 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/1330123889/pubg-uc-and-bp-free-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spin-link_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004872.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4872 35296 bytes
SHA-256: 283186a2c26b6bfe56c1d9d7ee6dbdc126ef41ed2b519a8d796c58c779b64a7d
font_01_sfnt_off000095b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B6 2816 bytes
SHA-256: 214f0b8c2b3c279476f862ae08d7e072944da5f6084cbd6130f0ffdc3460b614
font_02_sfnt_off00009f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F61 18412 bytes
SHA-256: 218ff6ad341087b33947833793efdcb1a8cab670ba625cf6567e496f61dd2057

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