Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c607aeda45045a…

MALICIOUS

PDF

36.6 KB Created: 2021-05-24 01:51:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4cb06063fb3085dc1bfd42972f8e5da6 SHA-1: acfce1382fec029f1abae6321e86d9d649adb3b1 SHA-256: 11c607aeda45045af186eb41abdb1f1174f57cde851019ecf57ce563f2ca1dde
122 Risk Score

Malware Insights

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

The PDF document employs a common lure of free game items to entice users into clicking a link. The primary link directs to 'netcdn.xyz', which is flagged as a high-risk URL associated with game hacks and redirects. The document also contains multiple other PDF links, likely part of a broader phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or redirect users to malicious sites, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-alts-game-hack PDF link annotation
    • https://dirigentigiustizia.it/images/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/minecraft-marketplace-free_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_off0000361a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x361A 25440 bytes
SHA-256: 14aeb81e698f7a9b45de850183efc2a53d6f4dfad10cb4beb53098da310032c3
font_01_sfnt_off00006fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCC 17644 bytes
SHA-256: 4350bb70586d7d356c834f80239bf16b03274066df9e9143be1036ee17eff588

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