Malicious PDF — malware analysis report

Static analysis result for SHA-256 583aa67f0e9276c5…

MALICIOUS

PDF

34.1 KB Created: 2021-06-25 22:09:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cdb52ccc1fd471b533940887fe93d7c1 SHA-1: 7182323415c32da51ee0acde9a039b010e863441 SHA-256: 583aa67f0e9276c50496da29f2f9aad384e03e2daf2e7268ff9712dae1a0fdb6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs designed to lure users into clicking on links related to game hacks and free currency. One primary URL, http://netcdn.co/app/431946152/roblox-free-robux-hack-no-survey-no-download-game-hack, is identified as a malicious redirector. The presence of a "download button" heuristic further supports the malicious intent of directing users to potentially harmful content. No scripts were extracted from this sample.

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/roblox-free-robux-hack-no-survey-no-download-game-hack In PDF document text
    • https://esl.hess.com.tw/image/data/files/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-robux-hack-no-human-verification-at-all_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/como-conseguir-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/mcpe-client_GM479516143.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-to-get-real-robux_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_off00002d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D75 21928 bytes
SHA-256: a772e6117e3d87fe95cdc7ac7aec8dde5e094ce01f47ef566c46fb5ec3ecc8fc
font_01_sfnt_off00005e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E09 19760 bytes
SHA-256: 3928faf9f05654807f4cc6f966775e02db2f8118c1c759e722388d8517a1e239

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