Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcefdbeac4d8e249…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 22:09:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ceea0337619a96bfdae2b443ad36caa3 SHA-1: 4fbdf228eaab1c20b863b061fcd9fd72e9d608af SHA-256: fcefdbeac4d8e249ea6daaa82405c5183d6d839934934d7fc6cc3ee8f28879dd
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 0.9865

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/how-to-hack-roblox-accounts-2021-easy-game-hack PDF link annotation
    • http://slim.sisminkada.net/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-cheat-farbe_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
stream_004_off00004e23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E23 27092 bytes
SHA-256: 80586bc85aed3a8d69b96480f027fae8d4427547630633b1b064c3fadbfc0f22
font_01_sfnt_off00008ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC1 19172 bytes
SHA-256: 0a4c192dd0d49b475d670e2028b2e3d9bc88486e58824ff416e2d46c0acce708

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