Malicious PDF — malware analysis report

Static analysis result for SHA-256 d044f6aead0042b8…

MALICIOUS

PDF

46.5 KB Created: 2021-06-04 01:51:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0f3e7fa94dc20760b9a49b1baf23472f SHA-1: d84d298b414805dead2994a56de01e33cf7e80ad SHA-256: d044f6aead0042b86e22b9c8ff07e88d85389ac1d35bca12430052bb074c7092
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users with promises of free game currency or hacks, such as 'Roblox Free Robux No Human Verification'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The presence of embedded URLs and the ML classification further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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-free-robux-no-human-verification-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pubg-uc-and-rp-generator_GM1330123889.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/smart-lodhi-coin-master-hack_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_off00005170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5170 28036 bytes
SHA-256: ed265f6132600b0ca0c2df51ca7b91eb0c24b999047d8f13f1a7f74cb36e6297
font_01_sfnt_off00009173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9173 18932 bytes
SHA-256: 9d302b82f438100f3cf39adb1b208b926e457e77310e02e89ba7e0c774768e38

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