PDF malware analysis — malicious · 072bfd4203831f86

MALICIOUS

PDF

43.8 KB Created: 2021-06-09 12:43:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 871af6bded8878411490cad0a206e0b5 SHA-1: 2eec2248dcb8f11b4e15afc035bd7bd5916ef3f8 SHA-256: 072bfd4203831f866ac14a5a807c8a8692c5096341f2908f7c0f73d68610d653

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to external websites, including one explicitly identified as a 'free generator / game hack' lure. The document body, though partially corrupted, contains text related to 'Free Robux Glitch' and references to game hacks, reinforcing the lure. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent. The primary attack pattern involves tricking users into visiting malicious sites by promising in-game rewards.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/how-to-get-free-robux-glitch-game-hack PDF link annotation
- https://www.orbai.ai/uploaded_files/userfiles/files/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/does-roblox-hack-your-computer_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/tiktok-free-trial_GM835599320.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/earn-robux-sites_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/free-avatar-roblox_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/roblox-free-items_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/roblox-t-shirt-free_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_004_off00004f50.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4F50	24588 bytes
SHA-256: `04a9410af36f081b1531b2457256b3b0188829d570581046ad4c1d354fcd74ac`
`font_01_sfnt_off00008771.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8771	18644 bytes
SHA-256: `82381717c6a6e49ffeb8da197a8f53772a15856842bcbb5f4ef501d1bceaca3b`

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