Malicious PDF — malware analysis report

Static analysis result for SHA-256 455a80f2a4d9db5b…

MALICIOUS

PDF

35.5 KB Created: 2021-06-27 22:48:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ab7c21a0fbfec2b613bb27cfe8fec4b2 SHA-1: 6f5b89ac99c286fe825909fadb148879798ed5bb SHA-256: 455a80f2a4d9db5b066b28337ede77559b5fe86f51a781db3e3dfaa9daad6d93
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/hack-roblox-jailbreak-money-2021-game-hack PDF link annotation
    • https://pustaka.mic.sch.id/repository/how-to-hack-rich-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-10-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-gun-script-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/pokemon-go-free-vs-premium_GM1094591345.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/infinite-jump-roblox-download-free_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/how-to-get-a-free-knife-in-roblox-assassin_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-hack-robux-and-tix_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-jailbreak-hack-2021-download_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/how-to-get-800-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/cheat-engine-using-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/boku-no-roblox-remastered-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/release-boku-no-roblox-remastered-free-lvl_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_off0000318a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318A 22548 bytes
SHA-256: f7fab92d84dfb24d8061f7ba5dfe14a04d4fab8cb238de9ab75391b339e12b9a
font_01_sfnt_off000063df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DF 19720 bytes
SHA-256: 65c58a2989dac01d478d5ff5a8f957d81135188296b62263b60d1feee64ff831

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