Malicious PDF — malware analysis report

Static analysis result for SHA-256 c315a9f706d0cf66…

MALICIOUS

PDF

34.7 KB Created: 2021-06-25 18:05:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 65f283d7d84b5078bf0ae2aa1862dbf4 SHA-1: da2665b4d2a95fb21ba9af5c471eaca3c0ffc15f SHA-256: c315a9f706d0cf664e4075a7fa6c879f8b5af9c3e84038ea232f69d0fce68bc3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting a 'free generator / game hack' for Roblox. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users with a fake offer to download potentially harmful content or visit further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/roblox-download-free-full-version-pc-game-hack In PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-can-you-teach-me-how-to-hack_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-free-draw_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-hack-roblox-passwords-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/robux-survey_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-exe-download-free_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-minecraft-packs_GM479516143.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
font_00_sfnt_off00002fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA5 22048 bytes
SHA-256: d7658c0e0359e299ac50b1bd4cfb215c09c573a27c379589d3de8521a592803b
font_01_sfnt_off00006079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6079 19704 bytes
SHA-256: 01f7ecb58ee79deea35f20d99699c7c3ee8ccf8d0a53487eaf222bf8c5bb563e

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