Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb23a4ce7edfc6f…

MALICIOUS

PDF

45.6 KB Created: 2021-05-16 15:02:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8745b70eed70e33b6bcd0e47c6280f90 SHA-1: 6a504df9d788cbe29b0fb407dbf47616d08c872a SHA-256: ceb23a4ce7edfc6f41fc5fe44f0cc4fcda7a4f6eba9040ec4bfcb6d6c11be1d0
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 0.9507

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/406889139/coin-master-promo-code-2021-game-hack PDF link annotation
    • https://vieclamjapan.com/upload/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-spins-download_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b7d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B7D 25388 bytes
SHA-256: 02527d0fdcb7f6147d3d4b7e332bcd32dfe5e3d42c9aac5979ab469a348cb76a
font_01_sfnt_off000084f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F4 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA6 18536 bytes
SHA-256: 78ba75ad106ca8b847d5b6b00c40510cee8ee17e324b6b043c23b4765ae22915

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