PDF malware analysis — malicious · c403661dbd039262

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 14:51:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 46255824d5972ca9fe80221a95ca4cb0 SHA-1: d95a6457e055c81e2c35a8cde23e899640c0f540 SHA-256: c403661dbd039262bc50abe6f3e9cd74868cf437569c93963f5c042203bcf296

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 0.9980

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 http://netcdn.tw/app/406889139/easy-free-spins-coin-master-game-hack PDF link annotation
- http://www.biochemix.com/uploaded_files/userfiles/files/roblox-shadowrun-free-pass-code_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/roblox-song-id-billie-elish-free_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/elemental-battlegrounds-roblox-hacks_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/admin-free-robux-codes_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/try-minecraft-free_GM479516143.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/free-roblox-banned-accounts_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/creepy-hacker-roblox-face_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/pokemon-go-free-30-ultra-balls_GM1094591345.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/nnuevo-hack-de-robux-20210_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/robux-free-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
`stream_002_off0000323c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x323C	23184 bytes
SHA-256: `62075fd6599611881ac9cc9b66a85156d767c18a9c486e6b429536839f909666`
`font_01_sfnt_off0000668e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x668E	18352 bytes
SHA-256: `3dbeee90ced00b057c13573698870247b5fa33fb8c249d2fc04228b0b27f4e1d`

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