Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a88d5b8bcba24e…

MALICIOUS

PDF

32.0 KB Created: 2021-07-06 18:05:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 186270cddfb19773b816b59506ee7e4a SHA-1: 2fcd8ac55197541f50911be1eded261f849229ee SHA-256: 53a88d5b8bcba24e9ad8f658345192595b9492d1cb2e75857c68ebe24d30d8e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for game hacks and free Robux, directing users to external URLs. It also hosts a large number of other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the structure points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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/431946152/free-robux-without-human-verification-2021-game-hack PDF link annotation
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/old-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux-just-by-2-steps_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/hack-day-z-2-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-dr-benx-hacken_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-robux-hack-script-for-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-hack-cookie-clicker-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-piano-hack-comment-faire_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AE8 22372 bytes
SHA-256: 039bf9cd537acbf63fc01e4a3cc4b31cfc2411f52ebb26cdcfd128667de0be75

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