Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55f64774b3a4a89…

MALICIOUS

PDF

42.4 KB Created: 2021-05-12 06:04:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 28316d6398cc284f6ed041fdd06cb677 SHA-1: 03a6c2f6f9689cb4fc6a9b7d9c2888dfbd73a9eb SHA-256: e55f64774b3a4a896cdf5ed94cf6d55c041ff1151c6a90e134c6ed2c05b99eed
82 Risk Score

Malware Insights

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

The PDF document impersonates Microsoft to lure users into downloading a 'free hair Roblox game hack' from the URL https://netcdn.xyz/app/431946152/free-hair-roblox-game-hack. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a credential phishing or malware distribution attempt. No scripts were extracted, but the overall pattern suggests a malicious document designed to trick users into executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/free-hair-roblox-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/431946152/free-hair-roblox-game-hack PDF link annotation
    • http://lib.akpnbahtera.ac.id/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/robux-redeem_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/earn-rbx_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
stream_003_off000047b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47B8 26132 bytes
SHA-256: dd5b52546afa747de146405f002513c6fca8f312e936f1c187fd076c1b8646ce
font_01_sfnt_off00008344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8344 18296 bytes
SHA-256: a0599e440df83d1220524ed19e510b9c2f6a3db0fbd0aff9e889db947f6eea7b

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