Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5d6c8ab4d90a84…

MALICIOUS

PDF

46.7 KB Created: 2021-05-20 01:37:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1c18adb3579cfaf3bb46168f515852cd SHA-1: 6371115b641bbb78ed183962a983074c5024d114 SHA-256: 8a5d6c8ab4d90a8413e5359d3449bb7d52cb71c9117122b4666f236319109b33
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically targeting users with lures related to game hacks and free currency generators. The heuristic firings confirm the presence of malicious redirector infrastructure and a lure for game hacks. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/406889139/coin-master-free-spin-and-coins-links-game-hack In PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/why-is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ca4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA4 28396 bytes
SHA-256: 0c6ddf2665b1d1461e359b176d8ece32703c82d04b9894321cf58129eeb6af69
font_01_sfnt_off00008a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9465 18228 bytes
SHA-256: ab1c4cdc214a6baf81a15e2f62a40ea9cfbbbf407f0f3dd1c7564e467cf0dae2

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