Malicious PDF — malware analysis report

Static analysis result for SHA-256 8517f7c9d7e74f79…

MALICIOUS

PDF

43.3 KB Created: 2021-05-17 10:56:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 79758913f5fa6b997d27da4dd7bfcaa1 SHA-1: d8219472e518889e133e33aea6395199b055b5a9 SHA-256: 8517f7c9d7e74f79892cc10813bbc1f15c3cff16dd540841280cb7ee9fc2ba1b
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 0.9969

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/how-to-hack-roblox-accounts-2021-easy-game-hack PDF link annotation
    • http://biccairo.com/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://biccairo.com/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://biccairo.com/images/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://biccairo.com/images/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://biccairo.com/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://biccairo.com/images/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://biccairo.com/images/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://biccairo.com/images/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://biccairo.com/images/robux-earner_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_003_off00004956.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4956 25520 bytes
SHA-256: 7b9300d66745c0dc3d915e67a67d69ff1261278a301f28884586ad89e65ed052
font_01_sfnt_off000083e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E1 19172 bytes
SHA-256: 0a4c192dd0d49b475d670e2028b2e3d9bc88486e58824ff416e2d46c0acce708

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