Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5a3659de5e7af8…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 22:56:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ce5bc8fd45d85261745749d05b791a99 SHA-1: 15a20f0508240f3205ddfd18ccf5d170f1c9ed60 SHA-256: 5e5a3659de5e7af8e55429cc7c9352286f91672df24405952bc4e49661e0212d
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple embedded links and a call-to-action lure, impersonating Netflix to trick users into clicking on links related to free Robux or game hacks. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates a request for sensitive information like private keys or passwords, suggesting a credential phishing attempt. The ML classifier and the presence of numerous external links point towards malicious intent, likely to lead to credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.online/app/431946152/how-to-get-free-robux-codes-2021-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.online/app/431946152/how-to-get-free-robux-codes-2021-game-hack PDF link annotation
    • https://perpustakaan.pn-bengkalis.go.id/repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/tiktok-free-textbooks_GM835599320.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/how-to-make-free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/roblox-comcom_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/hack-client_GM479516143.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-master-free-spins-today-daily-links_GM406889139.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_off000051f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51F5 27256 bytes
SHA-256: 09b27d0261862d91937f4257fa78a1aa5795da1b7212d08d404f006165dc4a37
font_01_sfnt_off00008eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAE 18856 bytes
SHA-256: 204886f9a3a3d456a8ba924f34e84de86e5dda13901e78a872ce278a746af401

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