Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ec3c9caca1f6dd…

MALICIOUS

PDF

45.7 KB Created: 2021-05-20 02:41:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3d248f05b1a8208a479d6dc56c3a5e2a SHA-1: 92a8d9ca8d609ac626327bf31fd96a595f5dd5f8 SHA-256: 07ec3c9caca1f6dd3068b2d0f293f20d49c208b9a8237273d9e44a97e9682007
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 0.9432

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-hacked-apk-download-for-android-game-hack PDF link annotation
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/roblox-phantom-forces-hack_GM431946152.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_off00004c9c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C9C 24680 bytes
SHA-256: 8f3570dc904b38beb03bc7bec6de7c3187e4f19d1e0afe36cbfb33a625b4f448
font_01_sfnt_off00008535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8535 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F20 18636 bytes
SHA-256: 87f24663a42dd6b293392c347e04cdb733edd0a8e3460407db1e5d5abad0db8a

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