Malicious PDF — malware analysis report

Static analysis result for SHA-256 9883fa0e05893b7e…

MALICIOUS

PDF

34.8 KB Created: 2021-06-28 14:17:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 74b7c0cbb2536345c73e71779f6126ee SHA-1: 98462d29ae354509a3a829372065a51b0a13059c SHA-256: 9883fa0e05893b7e268faf36687a5f89dda602b8acd86deecc28504ed29aa1ea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, designed to lure users into downloading potentially malicious content. The document body and embedded URLs suggest a scam related to 'free Robux' or game hacks, which is a common lure for malware distribution. The ML classifier also strongly indicated maliciousness.

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.co/app/431946152/free-robux-phone-number-verification-game-hack In PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-hack-v414_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-tshirts-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/i-will-hack-and-not-kill-parent-roblox-group_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-ad_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/appsmob-info-coin-master-hack_GM406889139.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_off00002f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F71 22424 bytes
SHA-256: aa9f3a5317065fef1aaf1017b3bf0e93701d510077a4106a2e0d63c940814ecb
font_01_sfnt_off00006157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6157 19656 bytes
SHA-256: 5079af2c96e93dcd6b21f25ad9c9844b5ca54153ad56c5138debd7d4c09af85b

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