PDF malware analysis — malicious · 36a8120cd93d1736

MALICIOUS

PDF

46.0 KB Created: 2021-05-14 05:45:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23

MD5: 1755f6b89ca49565b44a73a7821e0dc2 SHA-1: 3958a64302533b442f89b2ff4438f6ec490c89ca SHA-256: 36a8120cd93d17362f73df7942e9e294e59b4b27b5afacba81f741cb531d4062

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is designed as a lure, employing SEO poisoning tactics to attract users searching for game hacks and free resources. It contains numerous links to external PDF files hosted on 'mountain.mn' and a primary redirector URL on 'netcdn.xyz', which is known for malicious activity. The document body, though partially corrupted, contains references to these lures and URLs, indicating a workflow intended to lead users to potentially malicious content or downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9432

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.
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.
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/coin-master-hack-pc-2021-game-hack In PDF document text
- http://mountain.mn/uploads/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
- http://mountain.mn/uploads/files/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
- http://mountain.mn/uploads/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
- http://mountain.mn/uploads/files/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
- http://mountain.mn/uploads/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
- http://mountain.mn/uploads/files/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
- http://mountain.mn/uploads/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
- http://mountain.mn/uploads/files/oprewards-com-roblox_GM431946152.pdfIn PDF document text
- http://mountain.mn/uploads/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
- http://mountain.mn/uploads/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
- http://mountain.mn/uploads/files/get-free-robux-today_GM431946152.pdfIn PDF document text
- http://mountain.mn/uploads/files/robux-hack-2021_GM431946152.pdfIn PDF document text
- http://mountain.mn/uploads/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
- http://mountain.mn/uploads/files/roblox-hack_GM431946152.pdfIn PDF document text
- http://mountain.mn/uploads/files/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
- http://mountain.mn/uploads/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
- http://mountain.mn/uploads/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
- http://mountain.mn/uploads/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
- http://mountain.mn/uploads/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
- http://mountain.mn/uploads/files/free-robux-without-downloading-apps_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_003_off00004b20.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4B20	26688 bytes
SHA-256: `be8207105c138202923dd1df44842b6872418878cc790e2f53ca9c6e450b32b2`
`font_01_sfnt_off0000875c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x875C	2840 bytes
SHA-256: `3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676`
`font_02_sfnt_off0000910d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x910D	18272 bytes
SHA-256: `4ce3ab42f6c3214726693a9469983ea3a84a22c8702f7ff9142e51dd530be858`

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