Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a4ea5e1d3d63da…

MALICIOUS

PDF

36.0 KB Created: 2021-05-23 23:23:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 85e2636526c06baf85dea17017b562f7 SHA-1: 41ff473c5452fc96f421a3b650c1b86b7d29669e SHA-256: 79a4ea5e1d3d63dabd8a53a3973b468a79fff3336bb0f8e4deb26a4cb0d334f2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' and game hacks. The document body and heuristics confirm the presence of these lures, aiming to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to further malicious content.

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/431946152/free-robux-2021-game-hack In PDF document text
    • http://j-cook.pro/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://j-cook.pro/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://j-cook.pro/images/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://j-cook.pro/images/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://j-cook.pro/images/how-to-download-minecraft-for-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_off00002e9e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E9E 27396 bytes
SHA-256: 76f723a2b228dc1788a2a31f82f54a6dfed1132b4da74584d3c43c269c0fb7f8
font_01_sfnt_off00006af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF4 18416 bytes
SHA-256: a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b

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