PDF malware analysis — malicious · 8ab8d78dff818d45

MALICIOUS

PDF

45.6 KB Created: 2021-05-17 02:33:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: f1e5ffa54d0f646bd9672ea6d5388dae SHA-1: 5012546ec853587388bcc623a176b008409deb5f SHA-256: 8ab8d78dff818d45dc4b06be87717dc9e42f8eef17cf05e524769c8fa879bd37

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising "free generators" and "game hacks" to lure users. The primary redirector identified is https://netcdn.xyz/app/406889139/master-coin-free-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirection workflow, likely intended to lead users to further malicious content or downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9507

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/master-coin-free-game-hack In PDF document text
- https://naturenz.vn/public/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/wurst-18_GM479516143.pdfIn PDF document text
- https://naturenz.vn/public/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
- https://naturenz.vn/public/files/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/minecraft-free-version_GM479516143.pdfIn PDF document text
- https://naturenz.vn/public/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://naturenz.vn/public/files/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/apk-coin-master-hack_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/hack-minecraft_GM479516143.pdfIn PDF document text
- https://naturenz.vn/public/files/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/grab-points-login_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/free-coin-master-account_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off000048ee.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x48EE	27544 bytes
SHA-256: `f4a0ea97f24b0a64ef45587e13d414b5ca564eba944502350aea9b0d606f150c`
`font_01_sfnt_off000087b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x87B9	2840 bytes
SHA-256: `3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676`
`font_02_sfnt_off0000916b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x916B	17712 bytes
SHA-256: `91e2622ab411f5265f7b42a83c7ab878b3bc5f44429a3c49d98d87fe55e59feb`

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