PDF malware analysis — malicious · a6fe4083c59274b3

MALICIOUS

PDF

34.0 KB Created: 2021-07-20 03:54:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: fc5e065eef66f202e50a669febb79e97 SHA-1: 5b5f50e06a46c523417d24d7b4d42d12b4940a8a SHA-256: a6fe4083c59274b336bba2a6531a7a0998e4ef70022a8602335ea46a38b54527

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/how-to-get-free-robux-for-kids-game-hack. The document body and heuristics indicate a lure related to 'free Robux' or game hacks, designed to entice users to click the malicious links. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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/431946152/how-to-get-free-robux-for-kids-game-hack In PDF document text
- https://roberto-gac.com/images/coin-master-free-link_GM406889139.pdfIn PDF document text
- https://roberto-gac.com/images/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
- https://roberto-gac.com/images/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
- https://roberto-gac.com/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://roberto-gac.com/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
- https://roberto-gac.com/images/hacker-minecraft-song_GM479516143.pdfIn PDF document text
- https://roberto-gac.com/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
- https://roberto-gac.com/images/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
- https://roberto-gac.com/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
- https://roberto-gac.com/images/free-robux-promo-codes-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
`font_00_sfnt_off00002d03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2D03	23204 bytes
SHA-256: `33c3c013f1df84cf32de4a88b206860582f0cb6d040603c7fcf639624ef77887`
`font_01_sfnt_off0000614a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x614A	18764 bytes
SHA-256: `d079bf469505872766dd14d06cf0fce057ad6bb15d7e0a6d6ef53e681c132249`

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