Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4a77e750792911…

MALICIOUS

PDF

44.5 KB Created: 2021-06-07 06:51:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c7011315308eb0c317e6c74b3ab8fbf0 SHA-1: 48da4937e25c280e1b0b4190c04ff25da48e1197 SHA-256: 4b4a77e7507929117a98adfce414b6c680f49cd13607ad6a8f7fdf168fa4ae40
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure impersonating the UPS brand, directing users to click a link that does not match the brand's domain. The embedded URL points to a file hosted on 'netcdn.tw', which is suspicious. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-strucid-hit-box-hack-2021-august-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.tw/app/431946152/roblox-strucid-hit-box-hack-2021-august-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/tiktok-free-like-website_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F66 24564 bytes
SHA-256: 07041e8237ad4cd5bb51113458c8c12bcd77a3a98e71064d8766e57abda00cd9
font_01_sfnt_off000087c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C7 19412 bytes
SHA-256: f976bb4ee79958c6861b5af0a32e16b9cbd6c5a363bbf689d528ea192b2bb172

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