PDF malware analysis — malicious · a357b99b5ec22d90

MALICIOUS

PDF

49.5 KB Created: 2021-06-03 16:56:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22

MD5: 4a4112ee0188e5429781816d792e944a SHA-1: d6b0abc3cfba7c403ba2e20365441d8ad8131927 SHA-256: a357b99b5ec22d9090f9de3a5a3bbea53c25de0f737b9da1fd5689bfcf884b6e

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, specifically targeting users with lures for game hacks and free currency. The primary malicious URL identified is https://netcdn.online/app/406889139/unlimited-free-spins-coin-master-game-hack, which is presented as a "free generator / game hack". The document body, though heavily obfuscated, contains references to this URL and similar lures, suggesting an attempt to drive traffic to potentially malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

Heuristics 6

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.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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.online/app/406889139/unlimited-free-spins-coin-master-game-hack In PDF document text
- https://www.jcn.co.uk/uploads/files/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/robux-for-free-2021-no-vertification_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/robux-sites_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/robux-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-com-hack_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-script-executor-free_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/hacked-roblox-accounts-list_GM431946152.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_off0000520e.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x520E	29476 bytes
SHA-256: `8be423589f286d6bd3fee2098ab42209052725582223dc8780fb812a69076c19`
`font_01_sfnt_off00009467.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9467	2880 bytes
SHA-256: `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`
`font_02_sfnt_off00009e52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9E52	18580 bytes
SHA-256: `79bdf32172f69efa70b6d89136fd0b87cd2b95060cadafc40ebbe0559e92f71c`

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