Malicious PDF — malware analysis report

Static analysis result for SHA-256 579e8f631fcd0402…

MALICIOUS

PDF

45.5 KB Created: 2021-05-11 00:33:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7ef5d6c39db3adf9582a47385c26047d SHA-1: c658e0f347538ff398954c4c06af44129e7b5e3c SHA-256: 579e8f631fcd0402c1158242dd93179a6e613bb81d634abcd5bbc3244b570dfc
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-links-game-hack PDF link annotation
    • http://lib.icbc-indonesia.org/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-link-2021-today_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_off00004b84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B84 24500 bytes
SHA-256: 3fd8ebe2fab1e954394ba0dac6fc541d8b6b4bc35051175752c32882e20732bb
font_01_sfnt_off0000827a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x827A 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2C 19384 bytes
SHA-256: 9265dcf999fe3c2d8bc57d019a82117d49464dd7573aaa3fba49592fca3f6f04

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