Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa41a3cf8f780121…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 22:40:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 65d6c08544d420645e3c76b674754d97 SHA-1: 2d56e3215d3d7e7c44c5d09531d2ba9378941d8e SHA-256: aa41a3cf8f780121fa2c44e91d0d4dfe35069d93d070ee0997bcfc0b28074661
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector. The primary lure appears to be related to 'Coin Master' or 'Robux' hacks, aiming to trick users into visiting the malicious URL. The ML classifier strongly indicated maliciousness, and the presence of redirector links supports a phishing or scamming attack pattern.

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.tw/app/406889139/coin-master-free-spin-codes-game-hack In PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/app-master_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/free-tiktok-likes-and-views_GM835599320.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_off000033cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33CC 23608 bytes
SHA-256: 48cdb9eda25d02d854eef79708d5449e8706b22d51c3cc3487f30fc819e220bf
font_01_sfnt_off000068df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DF 18348 bytes
SHA-256: 9e9c4f8be19f0ad0d41979f724cf6b1bf7467f7e43e4e9071540c80937701c51

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