Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48aaec00e6737b9…

MALICIOUS

PDF

36.5 KB Created: 2021-06-30 04:37:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c1655d1b0c04ae140e426847347616e5 SHA-1: 9f8cd994502419de28f0837562b875e57d9169c2 SHA-256: f48aaec00e6737b91b70ffc5a6968704fe726f413fc3249f836bd18c06eab660
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are presented as 'how-to' guides for hacking popular games. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to distribute malicious content or lead to phishing pages. The presence of a download button lure and callback phishing context further supports a malicious intent.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.co/app/431946152/how-to-hack-into-any-roblox-account-2021-game-hack PDF link annotation
    • http://www.jsvillas.com.tw/assets/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-vehicle-simulator-free-gamepass_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/get-free-robux-on-a-ipad_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-2021-no-hack_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/does-pubg-uc-generator-work_GM1330123889.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-generator-fresh-update-5032021_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-pin-numbers-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/get-free-likes-on-tiktok_GM835599320.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_off0000350f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x350F 22632 bytes
SHA-256: 8f4b91a3223ee66de4c0792e63a9cd04157a3ce7688df37e2468983911b5b463
font_01_sfnt_off000067b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B5 19644 bytes
SHA-256: e2d8c129faa5f7c6530aed85c2c9cadeb644629b6f224744f5534f81215444f8