PDF malware analysis — malicious · 249f5455b9619a68

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 07:00:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24

MD5: eb2e446a7b39238114858662b6157171 SHA-1: 04f1c1037856d7e2efe1874baa9010c01d6f7d81 SHA-256: 249f5455b9619a68ed7a88a8da17cc7509b22a0c0ffb05040aff85529462b264

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 0.9865

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/479516143/minecraft-bedrock-server-hosting-free-game-hack PDF link annotation
- https://loba.com.vn/public/upload/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-promo-code-2021_GM406889139.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/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-tracker_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/earn-free-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/oprewards-com-earn_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/links-to-get-free-spins-on-coin-master_GM406889139.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_004_off000053b0.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x53B0	25108 bytes
SHA-256: `1373cbfec42e8570b019d5471f3f929092cbe3b5d84294721c3f66197960f2ca`
`font_01_sfnt_off00008c95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C95	18672 bytes
SHA-256: `c45ccb7756ad31f0eb1659f3c43916dbd490baa96d6c6b1730beaec095da97be`

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