PDF malware analysis — malicious · 187e4efbb3d190de

MALICIOUS

PDF

48.8 KB Created: 2021-06-08 22:31:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25

MD5: 3db81a6de0643494e8a52d7a6c2708a0 SHA-1: 0fb29c34c258c474b5aa242a9267250f612417e4 SHA-256: 187e4efbb3d190de4f4cd98a6a09c5a72a8dc80b1174619be0e0ad1bbf100476

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into downloading potentially unwanted or malicious content, masquerading as game hacks and free downloads. The primary redirector URL, https://netcdn.tw/app/431946152/elemental-battle-grounds-hack-roblox-game-hack, is associated with malicious activity. The document body, though partially garbled, contains references to game hacks and download prompts, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/elemental-battle-grounds-hack-roblox-game-hack In PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/roblox-hack_GM431946152.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/instant-robux_GM431946152.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/free-robux-survey_GM431946152.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/free-coin-master-game_GM406889139.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/pokemon-go-free-download-for-windows-10_GM1094591345.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
- https://www.stileadda.com/uploaded_files/userfiles/files/coin-master-spin-hack-pc_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_off00005521.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5521	25112 bytes
SHA-256: `ebe40a6d58366f9b2f554900ac41f182b30208ae475bf9b2f45963a99f79c1b1`
`font_01_sfnt_off00008f6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F6E	3084 bytes
SHA-256: `4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636`
`font_02_sfnt_off00009a13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9A13	18860 bytes
SHA-256: `ca8c87c5d708ebdb1b56e3af89ee2df57a6d801eda73572a3c5272b7fbf2d48b`

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