PDF malware analysis — malicious · a877e57753eb2b7a

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 12:05:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 817a6bf8d434e6a864b454fbbb5e8b52 SHA-1: 6c1b27dcfe90099c28885ddc19e81b167d933096 SHA-256: a877e57753eb2b7aff7f9ee736af9cd64663bb71c99834d85bd5e9fb65b412b8

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure, designed to lure users with promises of free Robux. The document body and embedded URLs strongly suggest a social engineering tactic to drive traffic to potentially malicious sites. No scripts were extracted, but the presence of malicious redirector links and the lure indicate a high likelihood of a phishing or scam attempt.

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/431946152/free-robux-roblox-help-game-hack In PDF document text
- https://www.dahu-villa.com.tw/upload/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/robux-offer-wall_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/20k-robux-accounts-free_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/free-tiktok-like_GM835599320.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/pubg-uc-buy-bd_GM1330123889.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/como-poner-hacks-en-roblox-en-orenador_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/free-robux-de-ohne-handynummer_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/free-robux-2021-survay-pc_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/old-roblox-play-for-free_GM431946152.pdfIn PDF document text
- https://www.dahu-villa.com.tw/upload/files/free-minecraft-worlds_GM479516143.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_off000030ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30CA	22836 bytes
SHA-256: `cced8743e115e5098480635264bdaeaea279a9dff9b54630a3c4c07a371ff2b7`
`font_01_sfnt_off000063c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x63C3	18968 bytes
SHA-256: `cc7cf679e870a2f925de5ede2fd2f58c7bdcd0ecacfa5a3ee4556f78741d8611`

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