PDF malware analysis — malicious · f846f47d04847ef7

MALICIOUS

PDF

42.0 KB Created: 2021-05-19 02:00:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25

MD5: fed50ff12bd0641b8cf611a2f46f2cd9 SHA-1: 71f78f92babde8013c948ae13b4dafd399651983 SHA-256: f846f47d04847ef74666e5cc0cab09b1551120fc2e601fe0f7ac331cd5686a3b

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically targeting users with lures related to popular games like Coin Master and Roblox. The primary redirector URL, https://netcdn.xyz/app/406889139/free-coins-and-spins-coin-master-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive users to malicious websites, likely for further exploitation or credential harvesting.

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 https://netcdn.xyz/app/406889139/free-coins-and-spins-coin-master-game-hack In PDF document text
- https://loba.com.vn/public/upload/files/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-now_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/earn-robux-today_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-hack-mod_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-do-u-get-free-robux_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
`stream_003_off00004bfb.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4BFB	23928 bytes
SHA-256: `7176fbee324a618b4f7c0c82ec5e19fb92f0b3f0576726e5fd8084aad89a373a`
`font_01_sfnt_off00008287.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8287	18060 bytes
SHA-256: `f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120`

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