Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27d6b8fe6e1ba8a…

MALICIOUS

PDF

46.1 KB Created: 2021-06-11 03:58:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a3a4bf153c712b7db36ec8b0fc469ec6 SHA-1: d8c3c431ef16e8c9dfc0a08396ec2b425f852d91 SHA-256: e27d6b8fe6e1ba8ab8171d5c3d9fd4d9b3844236ffac414cb72d57f666d988af
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 0.9864

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.tw/app/431946152/roblox-robux-hack-free-robux-generator-uirbx-club-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/roblox-code-generator-download-free_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/why-cant-i-buy-free-hats-in-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-how-to-make-gui-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/tiktok-free-tools_GM835599320.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-link-today-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
stream_004_off00005202.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5202 26636 bytes
SHA-256: 8ca3ccd979155806d21227d9c710401f18372b1c9de842f79e09093890cfe55b
font_01_sfnt_off00008ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF9 18896 bytes
SHA-256: 22ff7be4f23849ccabc3767cbbe1b3d32474c16b70d2c94f35ba7d4f4c664496

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