Malicious PDF — malware analysis report

Static analysis result for SHA-256 31077743f509c1bb…

MALICIOUS

PDF

35.1 KB Created: 2021-06-29 01:14:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fd3f32c29143f55b3cbe2d0f3a083ad6 SHA-1: 55ccf7eccae6c2c197200154cf3e9edfdf228d79 SHA-256: 31077743f509c1bb51d418c3603aa248cee4ecd09be7c1df09cf8056bd6765fb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, masquerading as a "Robux Reward Hack Tutorial" to entice users. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and the ML_NYX_PDF_MALICIOUS model strongly flags this PDF as malicious. The presence of embedded URLs suggests an attempt to redirect users to potentially malicious sites or download further payloads, aligning with a phishing or social engineering attack.

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/kristjon-15k-robux-reward-hack-tutorial-game-hack PDF link annotation
    • https://pasca.unisba.ac.id/elibrary/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-ton-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/robux-generator-com_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-no-human-verification-or-survey-2021-on-ipad_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-without-human-verification-for-kids_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/cookie-hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/finally-roblox-free-gifts_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-how-to-hack-someones-account_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/is-there-a-free-coding-platform-for-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-dragon-ball-online-cheat-codes_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-accounts-roblox-download-for-chromebook_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/best-roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/subscribe-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-card-pin-hack_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coinmaster-twitter_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_off000030bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BB 22352 bytes
SHA-256: 1b5980b4df17bca0d0a3a716343bd33c7f2e48effa0d83407c131217ef4afac6
font_01_sfnt_off000061f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 19788 bytes
SHA-256: ec1a3a94b61d7510a1701d570ab6f820c685d6ef739f0f71e18ef3a94704c371

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