Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79e8fb5f4dd78c6…

MALICIOUS

PDF

45.4 KB Created: 2021-05-19 13:01:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 331eaf7b40a0a78e9537ae994ce0dcf9 SHA-1: 4322e649bcc427e2ef311d171309dfff3dc13c69 SHA-256: b79e8fb5f4dd78c602cad16b29f70fb08008a14af88183a2e21ffad600f0584d
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/free-spins-coin-master-blogspot-game-hack PDF link annotation
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/best-hacked-client_GM479516143.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/www-coinmaster_GM406889139.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-pe-hack-client-2021_GM479516143.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/get-robux_GM431946152.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/free-coin-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://if.itk.ac.id/asset/backend/upload/ckeditor/files/hack-coin-master-nyc_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_off00004add.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADD 24912 bytes
SHA-256: c2a7982826f30e63af5ad2c52f670bf8aaf8ce0a3a6b90689f0564251e7885ae
font_01_sfnt_off0000848c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x848C 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3E 18464 bytes
SHA-256: 1c6dfc1f98a6641c171a543c2046344b7d819ff3e085ab3ae56c0ac3320f4f50

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