Malicious PDF — malware analysis report

Static analysis result for SHA-256 b860d854d2aed20a…

MALICIOUS

PDF

47.5 KB Created: 2021-05-13 07:25:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ea8192dfea6c4bfacff5d7ece5f8ea13 SHA-1: 21d3697e2ad13b4e04d2be6974f6bb89356dd028 SHA-256: b860d854d2aed20adc1fe7b818fa3fd688ef72ecd4b72869d6d3f2cea2d600c3
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 0.9977

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/431946152/robux-hack-no-human-verification-game-hack PDF link annotation
    • http://olesya-chagovets.com/images/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://olesya-chagovets.com/images/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://olesya-chagovets.com/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://olesya-chagovets.com/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://olesya-chagovets.com/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://olesya-chagovets.com/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://olesya-chagovets.com/images/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://olesya-chagovets.com/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://olesya-chagovets.com/images/minecraft-for-ps3-free_GM479516143.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_003_off00004a33.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A33 32436 bytes
SHA-256: c907f53e9196ce0b482eca617ab836e7fdae47396a9e83a7135314de6cf74544
font_01_sfnt_off000095d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95D1 18868 bytes
SHA-256: 8c41f3ed2032476b4a245afad5cd23074bff3a00c17c7f8f9be8353034b253b9

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