PDF malware analysis — malicious · ea81db3784f6bb38

MALICIOUS

PDF

33.4 KB Created: 2021-07-19 13:05:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 72fdc51b4801389a528fe661b93e5b66 SHA-1: 157f56a6e69912400c7e2c22229b13aba77ac5cf SHA-256: ea81db3784f6bb387d9a72b123f83080f5f1a47bd75363d813d198a9771e35e9

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generator' or 'game hack' lures. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-spins-coin-master-unlimited-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further payload delivery or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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 http://netcdn.tw/app/406889139/free-spins-coin-master-unlimited-game-hack In PDF document text
- https://www.sinaloadiario.mx/images/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
- https://www.sinaloadiario.mx/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
- https://www.sinaloadiario.mx/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
- https://www.sinaloadiario.mx/images/claim-free-robux_GM431946152.pdfIn PDF document text
- https://www.sinaloadiario.mx/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
- https://www.sinaloadiario.mx/images/hacker-minecraft-song_GM479516143.pdfIn PDF document text
- https://www.sinaloadiario.mx/images/free-robux-working_GM431946152.pdfIn PDF document text
- https://www.sinaloadiario.mx/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
- https://www.sinaloadiario.mx/images/make-free-robux_GM431946152.pdfIn PDF document text
- https://www.sinaloadiario.mx/images/roblox-hack-2021_GM431946152.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.

Filename	Kind	Source	Size
`stream_002_off00002a68.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2A68	23420 bytes
SHA-256: `19c38629f6426cf8da644b9c77ee86982309e6592535f1f2711c209aa1a2b2e7`
`font_01_sfnt_off00005fa4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5FA4	18580 bytes
SHA-256: `8aad0f2405ec9a3272b05944b48a23572f7af0293916013bea6eee8874d320e7`

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