Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80b32dbc45e64dc…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 00:15:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4680ff06bc51c00f17cbc6479c489731 SHA-1: 7bb68f4494f9d4a820b82fcd0e5286642d754c2d SHA-256: c80b32dbc45e64dc8e513d83bbe16e3adb9d4c8554c42f7bf9efc4157c13962b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising a 'free Robux' generator. The document body and heuristics indicate a lure for users to click these links, likely leading to further malicious content or downloads. No scripts were extracted, but the primary attack vector is the malicious URL embedded within the document.

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/free-robux-kid-friendly-no-human-verification-game-hack In PDF document text
    • https://wenshan.com.tw/upload/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-get-builders-club-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-generator-without-human-verification-site_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/robux-maker-free_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-20210-robux_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/roblox-mcso-hack-script-pastebin_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_off00002ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF0 22200 bytes
SHA-256: b93475afb5e87147e3ab6426d65b1e33062c2de4def0952995bbbdbec3625401
font_01_sfnt_off00006102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6102 19760 bytes
SHA-256: 81aab0412cfb0a87b1895216bf4af503bb533c0e0c6228ebd3d86b300273636c

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