Malicious PDF — malware analysis report

Static analysis result for SHA-256 5947a5766ca04a8c…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 09:15:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9ea6af63efc7ba913d87aac7e2cf0375 SHA-1: e4ad4e10e5e58ea2cac5e70126c4bcd0866a95bb SHA-256: 5947a5766ca04a8c5a4afc70105dfd2aab5d3d86b1cb6c62b25c7eb71d475f5e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are SEO-optimized and point to sites offering game hacks and free items, indicating a link farm designed to lure users. The presence of a Microsoft brand impersonation and a call-to-action link not matching the brand strongly suggests a credential phishing attempt or a lure for malware downloads. No scripts were extracted, but the sheer volume of malicious links and the ML classifier output point to a high-confidence malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • 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/roblox-com-free-play-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/roblox-com-free-play-game-hack PDF link annotation
    • http://pustaka-smpn3tpi.com/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/robux-money_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-website-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/rape-simulator_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
font_00_sfnt_off00005108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5108 27616 bytes
SHA-256: 91feff3027900c8f6cca96916e846e0e5a81717f01524a9da396791fcde66b7d
font_01_sfnt_off00008ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED3 18768 bytes
SHA-256: 7c9f64eaea5568b736ad355280abdaf35d8ff6f0dd4e48eccbcd06caf7914db9

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