PDF malware analysis — malicious · 40bc2ffdd5b836ff

MALICIOUS

PDF

35.2 KB Created: 2021-06-28 15:21:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 77d0044925eede586f11810d24f0e6c7 SHA-1: 954f47d357561e86e1bc8eb417b341396ef17834 SHA-256: 40bc2ffdd5b836ff1ba92c1a63efbc8e7d44e8035bca0475729734e7139d9702

62 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The document contains numerous embedded URLs and a prominent link to 'netcdn.co' which likely serves as a download host for malicious content. The 'ML_NYX_PDF_MALICIOUS' heuristic firing and the presence of lures like 'Free Robux Promotinal Codes' strongly indicate a phishing or scam attempt designed to trick users into downloading malware. No scripts were extracted from this sample, but the overall pattern suggests a downloader or exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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.co/app/431946152/free-robux-promotinal-codes-game-hack PDF link annotation
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/coin-master-free-online_GM406889139.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-get-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-roblox-virtual-items_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/heroes-online-roblox_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/roblox-hack_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
- https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-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_off0000303d.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x303D	22772 bytes
SHA-256: `5a261fbf4346e7bfa41cfb913d8a9e6546f691e3b6004f767b2141ed6e71cc32`
`font_01_sfnt_off0000632c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x632C	19604 bytes
SHA-256: `cfe5c9cbdab235acc0fc7446ee007e1585eb434443f4b01f09fcd6eec3e80da3`

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