PDF malware analysis — malicious · 069875a850273d20

MALICIOUS

PDF

35.3 KB Created: 2021-07-20 15:40:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 638fe04cbf35b00b139bc46c525050cb SHA-1: ad22bfbba605e5f3070ef57c839b2955097c4d07 SHA-256: 069875a850273d20df7214f8dc78988829db385e7e64df54deaeb72e57ed059a

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, specifically advertising 'free Robux' and game hacks. The document body and heuristics confirm the intent is to lure users to these malicious links, likely for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded links strongly indicate a social engineering attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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/free-robux-quiz-game-hack In PDF document text
- https://armatrutz.de/images/free-coin-master-links_GM406889139.pdfIn PDF document text
- https://armatrutz.de/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
- https://armatrutz.de/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
- https://armatrutz.de/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
- https://armatrutz.de/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
- https://armatrutz.de/images/free-robux-com_GM431946152.pdfIn PDF document text
- https://armatrutz.de/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://armatrutz.de/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
- https://armatrutz.de/images/robux-hack-2021_GM431946152.pdfIn PDF document text
- https://armatrutz.de/images/how-to-get-free-robux-without-verification-or-surveys_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_off000032b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x32B8	23308 bytes
SHA-256: `79652e31a252a71fe2e18a06f4383e4fc53dca45dfa60da92ffa0479e41d2803`
`font_01_sfnt_off0000673f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x673F	18560 bytes
SHA-256: `be8fcce7c5e8f21549de4f14d1ba57ce7d27096593ae719034b880f2108d8a25`

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