PDF malware analysis — malicious · a90ff44647520df2

MALICIOUS

PDF

33.6 KB Created: 2021-07-09 02:22:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: c65d26a9cce13c36f5328fc0fa48fe77 SHA-1: c7c46c63d0edb1b7035b5643a295485cbce95b1a SHA-256: a90ff44647520df2950ee8c52c77d87a35ddfd6884d7cedf25e21f8edeada418

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering game hacks and free in-game currency, such as 'free robux' and 'coin master spins'. One of the primary links, http://netcdn.tw/app/431946152/how-to-hack-roblox-jailbreak-game-hack, is flagged as a malicious redirector. The presence of these lures and the malicious redirector strongly suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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.tw/app/431946152/how-to-hack-roblox-jailbreak-game-hack In PDF document text
- https://purihostel.com/assets/CKImages/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/roblox-free-head_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-robux-no-download-or-email_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-robux-scams_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/www-coinmaster_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/hack-blox-piece-roblox-give-mod-menu_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-robux-with-proof-2021_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/shadowslayefighter-in-roblox-robux-hack_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/earn-free-robux-rbxnow-gg_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/roblox-for-free-without-signing-in_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/roblox-com-www_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/coin-master-free-coins-and-spins-app_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
`font_00_sfnt_off00002ddf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2DDF	21832 bytes
SHA-256: `2bbe3ccb69d441b0d305ed2f5ae2026edfeef009f9548ff335e1603bb78a25ea`
`font_01_sfnt_off00005e0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E0F	19104 bytes
SHA-256: `696a7a1a31584406119b272d138aa3833d155dde635b1dee8888fecfa5e4f887`

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