PDF malware analysis — malicious · 643338a1d123f220

MALICIOUS

PDF

33.1 KB Created: 2021-07-23 01:10:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 3cff2238e0aa710e18d78c228ed85ea6 SHA-1: 7a4c4c7c000629fc9ef8ff7d3d3a88caec9d0390 SHA-256: 643338a1d123f22058fda3aa5fac6f2899a8f5196c79b2fc3c7bd53b780ee61b

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as "game hacks" and "free spins". The primary lure is the URL http://netcdn.tw/app/406889139/coin-master-free-spins-promo-code-game-hack, which is associated with malicious redirector activity. The document body also contains a call to action to access a "COIN MASTER GENERATOR GB", further reinforcing the lure. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or redirection attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9900

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/coin-master-free-spins-promo-code-game-hack In PDF document text
- http://pesok-rk.ru/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
- http://pesok-rk.ru/images/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
- http://pesok-rk.ru/images/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
- http://pesok-rk.ru/images/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
- http://pesok-rk.ru/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
- http://pesok-rk.ru/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
- http://pesok-rk.ru/images/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
- http://pesok-rk.ru/images/free-robux_GM431946152.pdfIn PDF document text
- http://pesok-rk.ru/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
- http://pesok-rk.ru/images/how-do-you-get-free-robux-on-roblox_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_off00002adb.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2ADB	23040 bytes
SHA-256: `796d97c3b58fc7f9cffba8f79e3e7b54803f000bc1ed3c8dea4f2c39b8f3ac74`
`font_01_sfnt_off00005ec0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5EC0	18476 bytes
SHA-256: `dc3ef91c42b56b19e880a129857b9cc4209ff723fc15082788877c1745c42c0a`

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