Malicious PDF — malware analysis report

Static analysis result for SHA-256 d431cb7be535e56b…

MALICIOUS

PDF

42.7 KB Created: 2021-05-17 11:39:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 76613f2860931951c1e99b02499838d1 SHA-1: f4bb7563292e9ad9f2f861ea7e4d7fd317089efc SHA-256: d431cb7be535e56bf7c325702a6a9cb9ab4d2eeca248d0edc278bd7665096746
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to other PDF files, suggesting a link farm designed to distribute malicious content. The primary embedded URL, 'https://netcdn.xyz/app/479516143/how-to-get-minecraft-java-free-game-hack', is presented as a lure for free game hacks. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/479516143/how-to-get-minecraft-java-free-game-hack
    • http://nationshield.ae/userfiles/files/free-coin-master-spin-generator_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/toolbox-for-mcpe_GM479516143.pdf
    • http://nationshield.ae/userfiles/files/free-foxy-food-coin-master_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/hack-free-spin-coin-master_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/how-many-levels-are-in-coin-master_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/minecraft-pvp-hacks_GM479516143.pdf
    • http://nationshield.ae/userfiles/files/free-minecraft-java-edition_GM479516143.pdf
    • http://nationshield.ae/userfiles/files/how-to-hack-coin-master-game-without-verification_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdf
    • http://nationshield.ae/userfiles/files/coin-master-hack-spins-android_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/free-coin-master-game_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/minecraft-for-free-on-phone_GM479516143.pdf
    • http://nationshield.ae/userfiles/files/coin-master-hack-version-download-ios_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/rbx-website_GM431946152.pdf
    • http://nationshield.ae/userfiles/files/free-spins-on-coin-master-generator_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/coin-master-free-spin-whatsapp-group-link_GM406889139.pdf
    • http://nationshield.ae/userfiles/files/free-spins-coin-master-blogspot_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d74.bin
09e4d90f259689a99d573b40245be2c457a74a6f080e41b0999dafa1079b301f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D74 24320 bytes
font_01_sfnt_off00008509.bin
f45ec97da20a8e70f6e7437c3ced33d3bcbd99aef5af4daf3be0ff08d51a9e58
pdf-font-stream PDF embedded font (sfnt) at offset 0x8509 18152 bytes