PDF malware analysis — malicious · 16bac1a7e7b27e2a

MALICIOUS

PDF

35.4 KB Created: 2021-06-27 14:02:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01

MD5: a3fe7d08fc523499d05b89bb00ecc9da SHA-1: 96c0e8539ae53659d0eef81a7b9257b1a61f158c SHA-256: 16bac1a7e7b27e2aaaf0bf87916c8b639c3375141978efee93622d171b974def

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 0.9980

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.co/app/431946152/nuevo-hack-16sept-generador-de-robux-by-piignoiise-game-hack PDF link annotation
- https://www.advancissurgical.com/uploads/files/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/how-to-hack-someone-and-take-their-robux_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/robux-money-for-free_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/how-to-use-snowlords-roblox-hacks_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/free-tiktok-followers-without-survey_GM835599320.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/robux-hack-2021_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/como-tener-robux-con-cheat-engine-2021_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/hack-de-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/instant-robux_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/coin-master-ios-hack_GM406889139.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
- https://www.advancissurgical.com/uploads/files/files/100-robux_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
`font_00_sfnt_off00003092.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3092	22168 bytes
SHA-256: `0213639bf2d43480d4879dfba17f692992f6c54d22d4140dd27a7a8e234bc2d3`
`font_01_sfnt_off000061ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61EE	20188 bytes
SHA-256: `8404285b5d5f91180dea35ac5fe4560d99565c500abc7d13fac7cbea434f8de3`

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