PDF malware analysis — malicious · 3871d4a80c0bdfb2

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 07:08:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 6c93a7e533c98808aee87ab39410ab82 SHA-1: f087d114fc67014143f0ea08e273933fa27d6747 SHA-256: 3871d4a80c0bdfb2b2c51f15c4d3a26fbeaa50244119249b3bbc42eed9d185f5

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and free generators. The heuristic firings indicate that the PDF is designed to lure users into clicking these links, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of malicious redirector links and the ML classifier's high confidence score support this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9824

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/haktuts-coin-master-free-spins-game-hack In PDF document text
- https://www.sarsen.net/uploads/files/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/roblox-tiny-tanks-cheats_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-hack-roblox-with-proxy_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/is-free-robux-real_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/roblox-wanted-hack-pastebin_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/game-hunters-coin-master_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/www-free-robux-us_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-heaven-free-spins-link-2021-today_GM406889139.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_001_off00002aeb.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2AEB	23476 bytes
SHA-256: `c97421f39f020ce772c559a57d47b04fdaaa9f5ff88c689d4b5505ffe23b64d0`
`font_01_sfnt_off0000600a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x600A	18484 bytes
SHA-256: `d9a037a653ed28116979e3af0bb76bb4d7eaba1060cd405c4d4ff8bdf95a3337`

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