Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e45decb2a139f8d…

MALICIOUS

PDF

43.2 KB Created: 2021-05-13 14:04:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5bb923d52e280c906ce7f43008e9bfc4 SHA-1: d3b41257031575e215fd6021e4ac1c38dcfd45d7 SHA-256: 1e45decb2a139f8d1a1bad505056add27ca867ffd143c110be16f9d5354e259b
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 0.9969

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.xyz/app/431946152/free-robux-generator-2021-game-hack PDF link annotation
    • http://educhina.mn/editor/files/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/get-robux-today_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-daily-spins-and-coins_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
stream_003_off00004be5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE5 24728 bytes
SHA-256: de244ac585dfd1917988cd847ecc43d54b37d3ec6b18434707e6edacbea667f7
font_01_sfnt_off0000850d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x850D 18748 bytes
SHA-256: fca1806ffff7593a0a2d811b077fe14576afb362c0c2e8ffc695fbf8edc3964d

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