Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafe657d3af35dff…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 03:59:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ad1fe6e20c84b7d277921c4771e119e6 SHA-1: d3e74629dd22e952c12c8923a3599825a536780d SHA-256: dafe657d3af35dff829ee09df87801134364dbe1fad6957e1583ae59daa18ecb
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 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-daily-spins-and-coins-game-hack PDF link annotation
    • http://library.thamrin.ac.id/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/games-on-roblox-with-free-radios_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/como-tener-wall-hacks-en-roblox_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/roblox-hack-no-survey-no-download-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-roblox-t-shirts-that-are-cool_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_off00003000.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3000 22804 bytes
SHA-256: 7c7ad686e88ce20ac6b8e3d855b354a0ecee45405b3ce18824ab528d93eb018b
font_01_sfnt_off00006304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6304 18772 bytes
SHA-256: f3f8fa3a6eece84f4896eed170bca3035b504aefd00cdbf459e31d86686c87b4

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