Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c98e293a99ecd5…

MALICIOUS

PDF

35.0 KB Created: 2021-06-29 04:10:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0f16afa61e5825654aa5fd7cdf9d563b SHA-1: d6ccc76562eb05c145c3fab74d94dc2cdf9a1dea SHA-256: 78c98e293a99ecd552991f1b768a52af16a83330a5c660a9c6b43f57a167372f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs promising free Robux or game hacks. One prominent URL, http://netcdn.co/app/431946152/free-robux-no-email-no-download-game-hack, likely serves as a download point for a malicious payload. The presence of a "download button" heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to trick users into downloading and executing a secondary malicious file.

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/free-robux-no-email-no-download-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/how-to-get-any-hair-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/bot-that-buys-any-free-item-instantly-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-dont-sign-up-for-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-in-roblox-prison-life-no-virus_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-mobile-24-info-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-xbox360-download-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-roblox-im-poison_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/cheat-engine-la-roblox-para-hilesi-nasil-yapilir_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-tokyo-ghoul-bloody-nights-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-codes-without-human-verification_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-games-free-admin_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/games-on-roblox-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304B 22372 bytes
SHA-256: 849c3b033c3148f6fd6e3f6e634079bd995e4e1701e09d9a6cfbf36cda15c768
font_01_sfnt_off0000620b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620B 19676 bytes
SHA-256: 9a45a1dc548391b9a7c0719a2dca519092584bcc879385cb98f707af8ce62d9b

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