Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5f5eb10bcdeff0…

MALICIOUS

PDF

39.2 KB Created: 2021-05-10 13:42:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b130da77b8495b6fcfef961d40e55a0a SHA-1: 0fea80b8af3496e1dce8bab767f4e70850b2fa65 SHA-256: 3f5f5eb10bcdeff0634cdb5ad0bb936403f950696bddab5b2c55326203a20143
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and infrastructure, specifically advertising "free generators" and "game hacks" to lure victims. The ML classifier also flagged this PDF with high confidence. The embedded links likely lead to the download of a second-stage payload or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

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-drop-master-free-game-hack In PDF document text
    • http://hospitalsalamanca.cl/images/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/coin-master-hack-spin-generator_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
stream_003_off00003e18.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3E18 25176 bytes
SHA-256: f075efb620eea063f8c54a91ab4fc74ca1c692f04b71989c7fd01566acc12085
font_01_sfnt_off0000788f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x788F 18056 bytes
SHA-256: 11f18688a2b2da9a5c9f112f1650d1ea79688667bc5daef8815cb9676fc0e265

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