Malicious PDF — malware analysis report

Static analysis result for SHA-256 945131e96bbabd9c…

MALICIOUS

PDF

48.2 KB Created: 2021-05-11 17:05:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cbb48080b722eff8e472b78d29f1b44b SHA-1: fcf2cc7d61c72283ee96c4b06ec7d1f034b366cd SHA-256: 945131e96bbabd9c91039f33ce0cb49ad611539422a88b57cf0b9f6cb5645de0
182 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. It uses a password-protected-archive lure. 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 0.9977

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-2021-no-human-verification-game-hack PDF link annotation
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/wurst-commands_GM479516143.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/give-me-robux_GM431946152.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://perpus.stmkg.ac.id/stmkg-perpus/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004eaf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EAF 31300 bytes
SHA-256: e37cd72e4bed9170ed05e9e7f868a52358f0ce28e08fe6c6f4b66adad5a501f4
font_01_sfnt_off00009719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9719 19428 bytes
SHA-256: dfc7ca414cfca4f80301273998e01ceb4bfd22e3de883fcbe9d6a0102e8d41a4

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