PDF malware analysis — malicious · 48a4a6ed56998c0f

MALICIOUS

PDF

35.1 KB Created: 2021-06-28 06:24:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24

MD5: cd8cf622c32fdce9fdc0381177f9c2ff SHA-1: e2a7eff6a14f054e2611043d20a0ce52fc8f3dfd SHA-256: 48a4a6ed56998c0f05acb5bc99d32ed718cc2564293da9fe2f864d396c88a842

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/free-robux-codes-2021-on-ipad-game-hack PDF link annotation
- https://loba.com.vn/public/upload/files/flying-hacks-for-roblox-survivor_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-robux-on-robloxxxx_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/ben-10-universal-showdown-cheats-roblox_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-upload-audio-for-free_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/games-in-roblox-that-give-you-free-robux-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-animal-ears-roblox-hat_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coins-master-hacks_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-2021-exploit-free-lvl7_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/robuxian-hack-to-steal-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-a-lot-of-robux-for-free-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-batu-kol-faki_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-bear-face-mask-free_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-hack-2021_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_off00003183.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3183	22104 bytes
SHA-256: `a5b9f2693d666f7bb44fa40e7789af72787b022a82168318a65cbb84a6f4020f`
`font_01_sfnt_off000062af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62AF	19468 bytes
SHA-256: `df6f121dc5e28071d56c82e78cbba4cbc8b576b089a469f99dc062acf5662683`

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