Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc581ec20df91a50…

MALICIOUS

PDF

36.7 KB Created: 2021-05-21 03:19:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7ed40877d1bae5996230805c81967031 SHA-1: d441fa10b4f31611671e2e2d04d524240ec2845b SHA-256: bc581ec20df91a50e8d31b4141f2ed24a94d7aeae8a051244f0ae53cb9f77bd7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, including one identified as malicious infrastructure. The document body and embedded links suggest a lure for game-related cheats or hacks, aiming to trick users into downloading further malicious content. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-master-free-spins-promo-code-game-hack In PDF document text
    • http://grupodin.com.br/images/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/robux-for-offers_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/coin-master-fan-page-free-spins_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_off0000350a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x350A 24752 bytes
SHA-256: ec31f1a1042b11c2a87c3ea846bf8d2c0781f7c6163e60fbddc8aed6de4ba260
font_01_sfnt_off00006ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDC 18476 bytes
SHA-256: dc3ef91c42b56b19e880a129857b9cc4209ff723fc15082788877c1745c42c0a

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