PDF malware analysis — malicious · a918cd79f28057fa

MALICIOUS

PDF

35.7 KB Created: 2021-06-23 22:38:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: c358be2b6457f0cd87f21832f3eec311 SHA-1: 09cfa3e94fbda518e4b5cdb3cc93e7e34f681cf7 SHA-256: a918cd79f28057fa54b743022961d04bca5419d2da35122bafc8f8086a1c3033

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a known malicious infrastructure, likely serving as a lure for game hacks or free currency. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates a high probability of a phishing or malware distribution attempt. No scripts were extracted, but the document's structure and embedded URLs suggest it's designed to trick users into visiting malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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.co/app/406889139/free-spins-coin-master-2021-glitch-game-hack In PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/worst-roblox-avatars_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/roblox-pastbin-hack_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/roblox-phantom-forces-credits-hack-2021_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/robux-free-com_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/dungeon-quest-cheat-engine-roblox_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/roblox-fly-script-cheat-engine_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/cheat-for-roblox-2021_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/free-robux-today_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/free-robux-g_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/worst-client_GM479516143.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/claim-your-free-robux_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/how-to-hack-roblox-without-human-verification_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/roblox-anti-gravity-cheat-engine-hack_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/best-hack-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
- http://www.nguyentraiedu.vn/cms/public/upload/files/how-to-win-free-robux_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_off00003278.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3278	23320 bytes
SHA-256: `2ccc66f7a3bde772b1553fbda2cbdb8aa1d2303bd34b2a1641c233db2ca54fdb`
`font_01_sfnt_off0000675b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x675B	18816 bytes
SHA-256: `093958c3743730d88e10452a931daff3e3ab0252772ea76a07a8f5ecf7f3a6eb`

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