PDF malware analysis — malicious · bdcf10978e5aeb6b

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 08:24:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 0b1c95901ec75e8e68d790fc50338850 SHA-1: 17be6e11aba77efd8369c5ce9ecf987a65da2e5d SHA-256: bdcf10978e5aeb6bd902b24268f02e02e57a2888c551e35f5ed0a8ff1b94951c

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document functions as a link farm, employing lures related to game hacks and free in-game currency to entice users. It contains numerous external links, including a primary URL pointing to a 'free generator / game hack' site, and many others hosted on a recruitment domain, all designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or scam-related attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-daily-spins-from-coin-master-game-hack PDF link annotation
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/hacks-on-roblox-grand-theft-auto_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/tinyurl-free-robux_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/pokemon-go-free-games-online_GM1094591345.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-hack-org_GM406889139.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-free-spain_GM406889139.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/roblox-2021-1m-free-robux-give-away_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/5-roblox-games-that-give-free-robux-working_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-without-doing-anything_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/minecraft-wurst-client_GM479516143.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/how-to-get-free-roblox-card-codes-2021_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/hacks-that-work-for-roblox_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/robuxs-hack-no-survey-and-no-user-id_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.medlinerecruitment.com/uploaded_files/userfiles/files/how-to-hack-anyone-in-roblox_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00003237.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3237	22408 bytes
SHA-256: `770436e416880aa3c2e1fd5912b674f496fae19ed8b10b8e7f0e547ce5576594`
`font_01_sfnt_off00006402.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6402	18856 bytes
SHA-256: `d310d8b42a9db28f952d6c808dbfd2c0798e16e205ce104a4cdcfe428c53c924`

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