PDF malware analysis — malicious · 306b46b64f62e552

MALICIOUS

PDF

48.7 KB Created: 2021-05-12 03:50:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12

MD5: c27ea6174be9bcbda4c9773c8a9304cc SHA-1: b7e274b589d887c10a941e4db2a73dc80997eb8c SHA-256: 306b46b64f62e5529107a79be77cc23308475e9e0fb38567b592905659f0a962

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as a 'Robux Redeem' generator or game hack. It contains numerous links to external PDFs and a primary redirector URL, https://netcdn.xyz/app/431946152/robux-redeem-game-hack, which is flagged as malicious. The document body and embedded links suggest a social engineering tactic to drive traffic to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9228

Heuristics 5

PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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
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-redeem-game-hack In PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/play-coin-master_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-village-4_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
- https://sitecontabil.com.br/ckfinder/userfiles/files/robux-for-offers_GM431946152.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_off00004ae4.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4AE4	30996 bytes
SHA-256: `9d3becc5de4d12c5ae4bb349d43ad896dab426dbd3bd6acf64318b4914128c47`
`font_01_sfnt_off00008ef6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8EF6	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off00009c08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9C08	18284 bytes
SHA-256: `44dc1e2cf684a6e0cb1a9975d010cf8d82021a8fc0e8862ab9775ffa9cb00637`

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