PDF malware analysis — malicious · 65d1c5cd5b9bc548

MALICIOUS

PDF

47.3 KB Created: 2021-06-11 06:11:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11

MD5: a6b601274f4d5099a01ca9b5739028b2 SHA-1: f15fc6d6f168816ebd61146fee9de689ddb070e7 SHA-256: 65d1c5cd5b9bc548675a81ed78c3d88aac4ee62198d95aec8e1d236d2bdad341

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, specifically advertising game hacks and free generators. The document body, though heavily obfuscated, contains references to these lures. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

Heuristics 5

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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 https://netcdn.tw/app/431946152/how-to-follow-a-player-everywhere-he-goes-roblox-hack-game-hack In PDF document text
- https://loba.com.vn/public/upload/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-offline-hack_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-codes-50-rubux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-do-i-hack-roblox-to-give-me-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-cheat-free_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-clothes_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/wurst-client-18-9_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/download-coin-master-hack_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000051a2.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x51A2	24392 bytes
SHA-256: `d6523762897b530b5ac00a3f781c124af47a3ee79f82321c50a29a6fb75de5ef`
`font_01_sfnt_off000089c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x89C1	2840 bytes
SHA-256: `787e0768241fb57660bcc9c7f726cf687277c463cdf8c586c4782ee9d03c3606`
`font_02_sfnt_off00009380.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9380	19124 bytes
SHA-256: `272a3b5a35c15e00de6b2963089febbc144dedc2f5b4761662e7988a7b35a2fa`

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