Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d07be079c627c7…

MALICIOUS

PDF

47.1 KB Created: 2021-06-11 02:22:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 926e3ffd40de3fb40a79e0d58a6f4f80 SHA-1: 39fa1a244e49a88355513ea383dffa8f551f09c1 SHA-256: c7d07be079c627c765dd1b6f0abf578362a9ca65f2f9b4f813d4707265d9c954
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator / game hack' lures. The primary redirector URL is https://netcdn.tw/app/431946152/7aykw-duncan-free-robux-no-survey-human-verification-game-hack, which likely serves as a gateway to further malicious content or downloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/7aykw-duncan-free-robux-no-survey-human-verification-game-hack In PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-items-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-ore-finder-mod_GM479516143.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_off00005293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5293 27608 bytes
SHA-256: 725f218fb7349a830451bc8524e5d68f404ae92fc74b76bbf91e3ec396927e67
font_01_sfnt_off00009152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9152 19712 bytes
SHA-256: b5e5d10be806907bed48c2d3a111cd0f125185a326942c2ae310d41ea2d5604e

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