Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac36dd06d8fe8cc…

MALICIOUS

PDF

34.3 KB Created: 2021-07-07 05:11:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 844d149ed58f308a1d0d378b077680a4 SHA-1: 6a659af079de72e1976387626257f6b33e08199a SHA-256: 6ac36dd06d8fe8cc8ea94aecef8cbf455d99b93c758dde84adbcff6505a5ca43
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent external URI pointing to sites offering 'free Robux' and game hacks. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of it being used to distribute malware or lead users to phishing sites. While no scripts were explicitly extracted, the presence of numerous suspicious URLs and the ML detection suggest a malicious intent to trick users into downloading further malicious content.

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/431946152/how-do-you-earn-robux-game-hack In PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-printable-roblox-birthday-banner_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-roblox-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hack-roba-cuentas-de-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-system_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/black-tshirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/tiktok-free-palestine_GM835599320.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/medieval-warfare-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/minecraft-pocket-edition-free-download_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_off00002f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F58 22348 bytes
SHA-256: 4166d29ae42b56463b5949e5542732788e76db6108440f141570c70aaa596f78
font_01_sfnt_off000060e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E4 19048 bytes
SHA-256: 24e49863226dc28f9d0ab46f6a66c2a3903f06049e6c48910dd5e6d4fdc19de1

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