PDF malware analysis — malicious · ba8c78fafbbc176b

MALICIOUS

PDF

43.6 KB Created: 2021-05-15 05:14:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 6c3a793881908f1c86f5f4bbfaa1218e SHA-1: ab3cc1a8f90bfd63a3b2a511ae06bea2e69a0e2e SHA-256: ba8c78fafbbc176bf73da1d404bb3219ea302a0d20dadd391820bf0a1afca10e

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs related to game hacks and free currency. The primary lure appears to be for 'Coin Master' game cheats, directing users to potentially malicious sites. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support the malicious nature of this document, likely serving as a lure for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9969

Heuristics 5

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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/406889139/daily-free-coin-and-spin-link-for-coin-master-game-hack PDF link annotation
- https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/get-robux_GM431946152.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
- https://www.mescosa.com/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_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_003_off00004d82.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4D82	25720 bytes
SHA-256: `4689a2adf0ff81e7c1f201032c46267fd358277282787384a8c3efab8deef3ab`
`font_01_sfnt_off00008733.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8733	18652 bytes
SHA-256: `3777b5d13c6883454b23159e5c41cd83249453163b29f9aac7ae2dedc324f7ee`

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