Malicious PDF — malware analysis report

Static analysis result for SHA-256 55550d82f37f7dcb…

MALICIOUS

PDF

38.3 KB Created: 2021-05-13 12:30:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fe0b99d9d6167d458a7267ed1476a460 SHA-1: 1c65f28b6613c69ffba128790417a5cc1525b18c SHA-256: 55550d82f37f7dcbd9992c738202a4b5a0b65fc77f055a4430f3a33c9e6d0aee
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains text and links promoting a 'Free Robux' generator, which is a common lure for phishing and scamming operations. The primary link redirects to known malicious infrastructure, indicating a clear intent to lead the user to a harmful site. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-no-verify-2021-game-hack In 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_off00003539.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3539 27180 bytes
SHA-256: 09e0ae2bfe4b6f71ce483c87c686268176915f4e3d410a93f32570608b4c9e51
font_01_sfnt_off00007296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7296 18848 bytes
SHA-256: 9f147bd5bf62c652754f553854fad05fac0b8df637ce3021f80b740c61e7be7f

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