PDF malware analysis — malicious · 0ec89842083c54d1

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 12:32:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04

MD5: 51d6a1acc8dbb5bd429dd598ad50d7e8 SHA-1: 02046f91ea5b9a83b9d177a16223b3b888cb41f5 SHA-256: 0ec89842083c54d193d83c64c3cda623d58d1247aa1d5d3a91a24db8aed24f34

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9748

Heuristics 5

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.
PDF links to a 'free generator / game hack' redirector high 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.
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
External URI info PDF_URI

PDF contains an external URL action
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/how-to-get-free-spins-and-coins-in-coin-master-game-hack PDF link annotation
- https://www.insol-europe.org/uploads/files/files/minecraft-java-free_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-game-download-free_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-money-hack_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/mistplay-robux_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/tiktok-fans-free_GM835599320.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/daily-coin-master-free-spins_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_off000051be.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x51BE	24520 bytes
SHA-256: `f8b9d98a3fe91aa7aa92c4b27bacd17a3f148208ade8c7d835d4075eb96c87f2`
`font_01_sfnt_off000089cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x89CB	2824 bytes
SHA-256: `381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5`
`font_02_sfnt_off0000936e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x936E	18224 bytes
SHA-256: `1a177d96c25f70e29c96d18ff08cc0e48255fbbd4539b1ca90a782c549603dc1`

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