PDF malware analysis — malicious · ae556d08f2e6c120

MALICIOUS

PDF

42.1 KB Created: 2021-05-11 13:34:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 41f934771eda18251e2a0a0853aa03d2 SHA-1: b3b4ee6c2d717b9ec01f47762bc63503545a6d33 SHA-256: ae556d08f2e6c120f3aa28b7cc461ce3ba1d70ee26b28d6da2cacb947fb84491

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a prominent link disguised as a 'free Robux generator' or 'game hack'. This lure, combined with the ML classifier's high confidence and the presence of numerous similar links, strongly suggests a phishing or malware distribution attempt. The document likely exploits user interest in free in-game currency or cheats to redirect them to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/tryrbx-site-free-robux-game-hack PDF link annotation
- http://www.gravel.ru/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
- http://www.gravel.ru/images/coin-master-hack-tool_GM406889139.pdfIn PDF document text
- http://www.gravel.ru/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
- http://www.gravel.ru/images/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
- http://www.gravel.ru/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
- http://www.gravel.ru/images/free-robux-obby_GM431946152.pdfIn PDF document text
- http://www.gravel.ru/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
- http://www.gravel.ru/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
- http://www.gravel.ru/images/coin-master-tips_GM406889139.pdfIn PDF document text
- http://www.gravel.ru/images/minecraft-building-hacks_GM479516143.pdfIn PDF document text
- http://www.gravel.ru/images/give-me-robux-now_GM431946152.pdfIn PDF document text
- http://www.gravel.ru/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
- http://www.gravel.ru/images/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
- http://www.gravel.ru/images/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
- http://www.gravel.ru/images/free-roblox-followers_GM431946152.pdfIn PDF document text
- http://www.gravel.ru/images/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
- http://www.gravel.ru/images/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
- http://www.gravel.ru/images/coin-master-hack-android_GM406889139.pdfIn PDF document text
- http://www.gravel.ru/images/free-generator_GM431946152.pdfIn PDF document text
- http://www.gravel.ru/images/coin-master-daily-free-spin-app_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_003_off0000490a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x490A	24756 bytes
SHA-256: `aa6575122302ee4e63881a4f387b66960bf95263561bb22d84ac2124e317f33e`
`font_01_sfnt_off00008178.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8178	18420 bytes
SHA-256: `c05555d4ecf6fda64d59e10aa7bbdccb6b0b8342b7e9a04540fdd3a1ca0e8435`

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