Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ea08056a080ddd…

MALICIOUS

PDF

35.5 KB Created: 2021-07-06 00:31:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 38c22e6d90560f8061843eeacd48b09b SHA-1: ce80d10e7003e45a405fa0bc5aad0946903c1012 SHA-256: f8ea08056a080dddeb49fd3ae9f94929ae7473b41013df28930acd4b3fd6f779
160 Risk Score

Malware Insights

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

The PDF document contains multiple links and text related to "free Robux" and "game hacks", designed to lure users into clicking a malicious URL. The primary link, http://netcdn.tw/app/431946152/free-robux-no-verification-or-survey-game-hack, is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to a site that likely hosts a further exploit or malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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-no-verification-or-survey-game-hack In PDF document text
    • http://thamelinn.com/userfiles/files/hack-bighead-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/are-games-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-counter-for-roblox_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/haxteam-cf-free-robux_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-no-verify-human_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
stream_002_off00002f79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F79 23076 bytes
SHA-256: 91d781bba05d44121d61a02703a5ce4bf5c8187f2a28c20bfcbdfe1ab191bc80
font_01_sfnt_off00006361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6361 19368 bytes
SHA-256: 551afc8435a3263a9a14f68c6fac56cdd03dabd4713ff120a4b3cc718d9f39ef

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