Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a48f5a8116abed3…

MALICIOUS

PDF

42.4 KB Created: 2021-05-12 23:15:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 33a8037bf160e71d6d4bb2c4c40eeadd SHA-1: f08458a50fea316d6103289d4dbe9654da05da39 SHA-256: 8a48f5a8116abed3b7a3dc85408ca1776beb81f692bf5e5e0d9261a1ae4d44fd
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free currency. The embedded URL https://netcdn.xyz/app/406889139/freecoins-game-hack is identified as a known malicious redirector. While no scripts were extracted, the document's structure and embedded links strongly suggest it's designed to lead users to potentially harmful websites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/freecoins-game-hack In PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.leechan.com.cn/Public/upload/editorfiles/free-robux-without-human-verification_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_003_off000048fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FE 27340 bytes
SHA-256: c7f751e89f681992ba015b0f5b1d7e3e3b373d6f7dc9c53fa2ea07d58028c8c5
font_01_sfnt_off0000867f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x867F 17380 bytes
SHA-256: b7451c9dd0ac59d2b5cb55b76db2f7cf076c87adc9efeb70e2d733c8c551e0a5

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