PDF malware analysis — malicious · b6576b190c46f19c

MALICIOUS

PDF

48.9 KB Created: 2021-06-08 21:15:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27

MD5: c4c1a08d79060518d7960233d078ec82 SHA-1: ac094cba9ea37eb8a1fad05aff9a8b3b958fe581 SHA-256: b6576b190c46f19c7123ee3a5df3c19b26307d7a9871cf09a1c17808494965b8

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document employs a lure of 'free game hacks' to entice users to click on embedded links. These links redirect to external URLs, which in turn host further malicious PDF files, suggesting a multi-stage download or redirection scheme. The ML classifier strongly indicated maliciousness, and the PDF structure contains external URI references consistent with this type of attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

Heuristics 4

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.tw/app/431946152/free-clothing-catalogs-roblox-game-hack PDF link annotation
- https://htdvn.com/public/upload/files/roblox-free-bundles_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/rape-simulator_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
- https://htdvn.com/public/upload/files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
- https://htdvn.com/public/upload/files/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
- https://htdvn.com/public/upload/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://htdvn.com/public/upload/files/roblox-hack-how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
- https://htdvn.com/public/upload/files/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/minecraft-beta-free_GM479516143.pdfIn PDF document text
- https://htdvn.com/public/upload/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
- https://htdvn.com/public/upload/files/free-minecraft-client_GM479516143.pdfIn PDF document text
- https://htdvn.com/public/upload/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/pubg-uc-logo_GM1330123889.pdfIn PDF document text
- https://htdvn.com/public/upload/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://htdvn.com/public/upload/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/get-free-roblox_GM431946152.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_off0000548a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x548A	26152 bytes
SHA-256: `61ec8ee1b79fdeea82033f87008064345faa7c0855e7bcbc5c8494eca9a39711`
`font_01_sfnt_off0000910f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x910F	2872 bytes
SHA-256: `c99ae1e18c85745b872cec3b6e961f98101e55ddf308cd7ca8b8a3fb0101e183`
`font_02_sfnt_off00009af6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9AF6	18856 bytes
SHA-256: `64b66dc3cf77695c14f5e34db0ad325845c609c96cc60b431b15598fc6a80314`

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