Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecffa4483e7bc0ca…

MALICIOUS

PDF

35.7 KB Created: 2021-05-21 13:11:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a1a70f3e8207ea5c471afa297e54fe90 SHA-1: aa37d96491db05712516ea822d5da40f68342391 SHA-256: ecffa4483e7bc0cad5cf64e50ac4e80d3b198f75cdd98f9213c97d2d3d749653
200 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, masquerading as a lure for game hacks and free items, while impersonating Microsoft. The primary malicious URL identified is https://netcdn.xyz/app/479516143/free-minecraft-addons-game-hack. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-addons-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-addons-game-hack In PDF document text
    • http://www.jetape.com.br/ckfinder/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.jetape.com.br/ckfinder/userfiles/files/more-robux_GM431946152.pdfIn PDF document text
    • http://www.jetape.com.br/ckfinder/userfiles/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.jetape.com.br/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.jetape.com.br/ckfinder/userfiles/files/minecraft-free-ios-2021_GM479516143.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_off00003474.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3474 24384 bytes
SHA-256: 9373e1cfc9936d6f1cb92af04b517fdce14e73b3bf450a790aba952e8d3d978a
font_01_sfnt_off00006b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8E 17884 bytes
SHA-256: 2acb4cd1bca1b5a723691e5edbd5eaf48ec188cda9d27986775bd20f5f6dc65a

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