Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cf84cbc0f7aad4…

MALICIOUS

PDF

35.5 KB Created: 2021-05-21 23:05:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 731428fd4bd6219c8742259925d0df29 SHA-1: 5c52588404f7c6665f79a5a93dcc84d9e36520fe SHA-256: 64cf84cbc0f7aad4525c182460da6cc4d9930a29ac41ad54a30c2dd9e0430ab2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically promoting 'free spins' and 'game hacks' for popular games. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest a phishing or scam attempt to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/free-spins-coin-master-2021-game-hack In PDF document text
    • https://www.nationalmilklaboratories.co.uk/uploads/files/files/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • https://www.nationalmilklaboratories.co.uk/uploads/files/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://www.nationalmilklaboratories.co.uk/uploads/files/files/coin-master-hack-spins_GM406889139.pdfIn PDF document text
    • https://www.nationalmilklaboratories.co.uk/uploads/files/files/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • https://www.nationalmilklaboratories.co.uk/uploads/files/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F1 24176 bytes
SHA-256: 2fcc893074fde0f628a87b5a789dab2638685f05aa635e6079aa6d8d680b4316
font_01_sfnt_off0000696a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x696A 18288 bytes
SHA-256: 9732707b45c862b7a6ef8ea2418900def9be3650c6b325207d932644f64622ad

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