Malicious PDF — malware analysis report

Static analysis result for SHA-256 da91fb4aa55b3bb1…

MALICIOUS

PDF

41.7 KB Created: 2021-05-15 13:42:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d605168667114af8fe30190be4133631 SHA-1: c54941f29f346166578ee0e92232d4de79aef6a3 SHA-256: da91fb4aa55b3bb1b5e7208ec0f168f96ab4ab6cb8a133a5bf81654d3a0dc849
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs pointing to sites offering game cheats and hacks, such as 'coin-master-free-spin-and-coin-game-hack'. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to a malicious site. While no scripts were explicitly extracted, the document's structure and embedded links indicate a lure for potentially unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-spin-and-coin-game-hack In PDF document text
    • http://pdia.de/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/robux-app_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/minecraft-pe-free-download-ios_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_003_off000048a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A0 24976 bytes
SHA-256: acf3320e44e05b6fb8b75a01abedc351ae9bf22f71ea00c2ec071b1f289b338f
font_01_sfnt_off00008157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8157 18060 bytes
SHA-256: 7f8980b6f3213b204c7b050e62c653166806b65682437d624869b2fc7a4cb6a7

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