Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b4fe1dde93e62e…

MALICIOUS

PDF

44.4 KB Created: 2021-05-16 22:32:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f99907e4a57522901522e076aa1ab4e6 SHA-1: aca76394bcb0a43cf8dfbdd195d4384c73dc9e36 SHA-256: a3b4fe1dde93e62ee9d3930adc336a8854eb273557fc272f8606e2615df868c6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free Robux' generator. The embedded URL leads to known malicious infrastructure. While no scripts were extracted, the document's content and heuristics strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0366

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-that-actually-works-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000037c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37C5 36316 bytes
SHA-256: f4ec4290476cff56ee2a5abc9a82d5a02eb4bc45ccab1dfb31fe71f7f472afa8
font_01_sfnt_off000088ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88EF 19536 bytes
SHA-256: e162f10ab45425f1911b766a767f4688be22e04cba15be94f938466a51fc2df0

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