PDF malware analysis — malicious · bac16b6457bd9816

MALICIOUS

PDF

46.8 KB Created: 2021-05-16 00:37:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04

MD5: 4db4131a66401fac65413ea04054a0fe SHA-1: 96c381f09c7afc2d3c7ab3c8be1495517ce57076 SHA-256: bac16b6457bd9816dd6396c7880bb07ca57cf9e55c3b7d8844e15f228398f48d

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.8948

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/robux-hack-no-verification-game-hack PDF link annotation
- http://www.bestbist.com/assets/uploads/pages/files/robux-link_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-roblox-com_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-com_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-hack-com_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/get-me-free-robux_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/roblox-com-free-play_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-official-website_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-games-like-roblox_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/create-minecraft-server-free_GM479516143.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_003_off00004acf.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4ACF	27376 bytes
SHA-256: `38f22bc419b01a04d263c1494dab683e5376a5296185a4afce4f8092c938e2cf`
`font_01_sfnt_off000089d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x89D1	2812 bytes
SHA-256: `fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f`
`font_02_sfnt_off00009372.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9372	18604 bytes
SHA-256: `770f8f6a3c3ea9ac3c319881d9f8005aae44889e6d1fc0dc42f8814bbcec8619`

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