Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec7a7c0491bf710…

MALICIOUS

PDF

33.3 KB Created: 2021-07-08 01:23:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e86992093a90dfe8762c9eb64e2e8fde SHA-1: 17069828d09ac531a27bc44b883e381681d1f7d2 SHA-256: 4ec7a7c0491bf710ec04c55f2fceb9fa7ec3a406bf9093a10dce8a2c5c570509
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/479516143/minecraft-pe-free-ios-game-hack PDF link annotation
    • https://ourlady-elearning.com/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-do-i-change-my-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-tiny-tanks-hack-for-rocket_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/minecraft-login-free_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-lawsuit_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
font_00_sfnt_off00003057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3057 21880 bytes
SHA-256: 03ad92ed532902bf802e074a4fb31a9cddbc8568028e99128038080c1bd21537
font_01_sfnt_off00005fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDC 18152 bytes
SHA-256: 9217169def43f8c16a67344ac79484d347e21e3639697df2a6f77d3a213ff034

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