Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb8a7541b2a4e9e…

MALICIOUS

PDF

47.3 KB Created: 2021-05-14 04:58:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1609854a6b08641d41aecc9f85e6e633 SHA-1: 201ee833bf7fa89965d46891b8ab906cd18a3b64 SHA-256: cfb8a7541b2a4e9e62c8086659e19be5153805cc4f280b100431a75a5f4540bc
82 Risk Score

Malware Insights

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

The document employs a fake CAPTCHA lure to deceive users into clicking a link, which is a common social engineering tactic. The embedded URI points to a suspicious domain, likely serving as a download source for a secondary payload. While no scripts were directly extracted, the PDF structure and heuristics suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/dailyrobux-game-hack PDF link annotation
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/village-4-coin-master_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/spin-and-coin_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aa5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA5 27004 bytes
SHA-256: 2039fb28951b3957c17edd16b31ad56fcc8294c9e620398196091d4bf3c037fb
font_01_sfnt_off00008823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8823 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9534 18620 bytes
SHA-256: 006376ad9c7b73d4fd15d3b6dd3ffa9064f0af8ff6d6cdc29d45d1e9c8c3f0f5

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