Malicious PDF — malware analysis report

Static analysis result for SHA-256 f328ef572fed2f78…

MALICIOUS

PDF

34.6 KB Created: 2021-06-26 14:49:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2994fc3a258a02cd9267a0ede59750c2 SHA-1: af56a413d030beaf5d205b2e0be0a18b6932876f SHA-256: f328ef572fed2f78de497a4a0ee700f84d192dbe987ab4f4183454dc19541f0a
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are SEO-optimized and point to sites offering 'free Robux' or game hacks. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external links, suggesting a tactic to drive traffic to potentially malicious download sites. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.co/app/431946152/how-to-get-free-robux-no-subscribing-2021-game-hack PDF link annotation
    • http://opac.disarpus.surakarta.go.id/repository/free-candy-van-script-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-accounts-with-robux-dantdm_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-games-online-on-robloxcom_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-free-free-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-generator-no-survey-no-download_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-win-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-roblox-2021-easy_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-apk-mod_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_off00002f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7B 22260 bytes
SHA-256: 1012142d26b50bdce10a3e308bf3c82a2cc2afcc2c2dc0fe8a1f644a68b9e7e6
font_01_sfnt_off000060c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C3 19508 bytes
SHA-256: d49c0fc1655751d518b6ff2c8b2c2f47954ef00b87351608ac95e5bc0a930348

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