Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d4a4ed36015b88…

MALICIOUS

PDF

36.9 KB Created: 2021-05-22 07:36:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d8ab2563f87c2ac7ee8a9298b3db7d9a SHA-1: 093574528bd7edb33f6ca8a6a90d1acdbef38afa SHA-256: 15d4a4ed36015b88306f59c59949d91c664255248f9cd62b6bac1b980bbeabf4
200 Risk Score

Malware Insights

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

The PDF document contains embedded links that impersonate Microsoft to lure users into clicking on a link for free game items. This link redirects to malicious infrastructure, indicating a credential phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/479516143/free-minecraft-maps-game-hack.
  • 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/479516143/free-minecraft-maps-game-hack In PDF document text
    • http://www.manchieu.vn/upload/editor/files/100-robux_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/legit-coin-master-hack_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_002_off000035bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35BB 26832 bytes
SHA-256: 84e716a8b14e7c2f5faf12376ae3b9a000f22250f4d4c6bb24a012e2ec097eec
font_01_sfnt_off0000709a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x709A 17744 bytes
SHA-256: 642e76b92f67015eb87e7bb2f8978493590a3d76ebc6958dd5b149369a6bd5f2

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