PDF malware analysis — malicious · 2f1804a342c2b873

MALICIOUS

PDF

47.8 KB Created: 2021-06-03 11:58:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: e56906e6706368482c3ea49954028a1d SHA-1: 16043c624fa984531a71f560bc4df0150cebc946 SHA-256: 2f1804a342c2b87377c0c74db2463ea4dc7224cad53d5f436942ffa108c3e9e8

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 0.9769

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/431946152/roblox-script-hacks-game-hack PDF link annotation
- https://www.insol-europe.org/uploads/files/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/tiktok-free-template_GM835599320.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-hack-spins_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-coin-master-links_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-get-free-pokeballs-in-pokemon-go_GM1094591345.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-become-a-hacker-in-roblox_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
`font_00_sfnt_off00004ff3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4FF3	25148 bytes
SHA-256: `4e3afb8db533b90479f538ffec5988294939888a668e953b3b965b47b1fd3e8f`
`font_01_sfnt_off000089c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x89C9	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off000096db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x96DB	18580 bytes
SHA-256: `535ec4be0d2657e9981f9200dcc4c4c41f6589372ce54f218017d5d6a2e1f0f5`

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