Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bb8e9294702b61…

MALICIOUS

PDF

36.7 KB Created: 2021-07-08 10:14:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 036f9cdca48ae3e5f1854465bca38500 SHA-1: 6b57580010bf6ac87427cd5a6b289d48d10417fb SHA-256: 77bb8e9294702b61f0ff6ebf3a71f77aff5bdb091a3851c93d91ef0c9cbaf5f8
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 game hacks and free currency generators. The primary link, http://netcdn.tw/app/406889139/master-coin-free-spin-daily-game-hack, is identified as a malicious redirector. The document's content and heuristics strongly suggest a social engineering lure to trick users into visiting potentially harmful sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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.tw/app/406889139/master-coin-free-spin-daily-game-hack In PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/high-jump-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/best-and-easiest-roblox-hack-for-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/get-free-rank-in-roblox-group_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/can-i-have-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/robuxian-500m-robux-hack_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-games-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-hack-a-roblox-server-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/weird-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB0 22412 bytes
SHA-256: df324d60375896e84018a33690c237ff61fbf38b9cf5dfc4615bbec4be992c8a
font_01_sfnt_off00006199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6199 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7E 18596 bytes
SHA-256: 115892fac058e21728dd73f14dd50efb9625691fb0bdc47d6e9343c2bb96a73b

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