Malicious PDF — malware analysis report

Static analysis result for SHA-256 efacd9178b5c7d16…

MALICIOUS

PDF

33.8 KB Created: 2021-06-19 15:56:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4814ec461c41c0113e5e5a433e5b7cf6 SHA-1: e7e554a02306bb34148e9800f13f0582861bd879 SHA-256: efacd9178b5c7d16a794087c2aec2c6c3382e7b2cf4699241ce0cab9d92069e0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a malicious redirector, likely designed to deliver a second-stage payload. The document body and heuristics indicate a lure related to free game items or hacks, a common tactic for phishing or malware distribution. The presence of multiple related URLs suggests a coordinated campaign.

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-avatar-skins-for-free-game-hack In PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-into-peoples-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-accounts-2021-with-robux_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_off00002e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E92 21976 bytes
SHA-256: b281b00c23c78a48d5c41037d4299809acbeb6ed80ed2729ed6714a88de1efaf
font_01_sfnt_off00005edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDD 19160 bytes
SHA-256: aefbf1ca14d84cdb3ea3ad03f8719347968e3c29762da8500f5e06b1709778e9

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