PDF malware analysis — malicious · b84d6398dbdade0e

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 16:01:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23

MD5: 51a8d7db476c384d4986f1cd8483d971 SHA-1: 7824ccbcd731181066057758ef4496b3e405f318 SHA-256: b84d6398dbdade0e417d9789f47280ef8c4ee30bc5c6ff188d265a2c53ca361c

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators'. The document body and extracted URLs suggest a lure for users seeking in-game items or cheats, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

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.
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 http://netcdn.tw/app/431946152/free-shirt-templates-roblox-game-hack In PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/roblox-forcefield-hack_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/roblox-skins-hack_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/free-chloe-on-roblox_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/roblox-sprinting-simulator-how-to-do-a-fast-hack_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/corrupt-free-roblox-torso_GM431946152.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/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/free-things-in-roblox-catalog_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/userfiles/files/how-to-hack-roblox-with-inspect-element-2021_GM431946152.pdfIn PDF document text
- https://www.orbai.ai/uploaded_files/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
`font_00_sfnt_off00002f80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2F80	21804 bytes
SHA-256: `15f4866f7354d75472d487e22bda2d9cfee42ab3209808cfbd340819da9abe83`
`font_01_sfnt_off00005f5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F5C	19476 bytes
SHA-256: `6e93157c38133fac4eb73ffad4cfd3433971474811c65c7061d5be818054ee40`

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