Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59f3c4bc9de5b3f…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 18:58:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 19d371d4f2db5ae6330fff980887ece6 SHA-1: 27cdc2ec5fedfcecaa3504319efb230581fa238a SHA-256: e59f3c4bc9de5b3fe18a700f579f155a375a62b031c7c8b98232103662c93a62
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on 'c2o-library.net' and appear to be part of a link farm designed to attract users searching for game hacks and cheats. The document body and heuristics indicate a lure related to 'Coin Master' and 'Roblox' game hacks, suggesting a phishing or malware distribution attempt. The presence of multiple external links and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.tw/app/406889139/coin-master-free-stuff-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/free-h-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-and-tix-on-roblox-youtube_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-coins_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-into-your-roblox-accout-witout-the-password_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/counter-blox-roblox-offensive-cheats_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/dowload-wall-hack-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-fly-hack-bit-slicer_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/https-oprewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/pubg-uc-18_GM1330123889.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-hack-online_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/pubg-uc-kr-version_GM1330123889.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-gift-cards-codes-by-inspect_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_002_off000032a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A7 22628 bytes
SHA-256: a3ec291a2d064adb9684ffd0385844d970cb15ba64001a9466678b6ed28b521a
font_01_sfnt_off00006529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6529 18140 bytes
SHA-256: ffbe3bd5e7ca89ebd9867be994f107e79cc056fa0179a9297eb86efc4e13e545

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