PDF malware analysis — malicious · 275d6829738ab1e8

MALICIOUS

PDF

35.7 KB Created: 2021-06-27 02:52:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20

MD5: b44ae6dfc4f52c07bdb51eee3727e1c9 SHA-1: 81d649f388ac71ad32f31bd7910ae6b1fa02ad7f SHA-256: 275d6829738ab1e82b6719c90123f0fa51dd8a765b799d4ed6d446e477852320

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/how-to-get-free-robux-on-roblox-mobile-game-hack. This lure is designed to trick users into believing they can obtain free game currency or hacks. The document body and embedded URLs reinforce this theme, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a high likelihood of a malicious workflow.

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.co/app/431946152/how-to-get-free-robux-on-roblox-mobile-game-hack In PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-coins_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/master-coin-hack-app_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/biggerhead-roblox-free_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-get-a-shoulder-pet-on-roblox-for-free_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-minecraft-java-server_GM479516143.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/www-robux-hack_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-savage-roblox_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-roblox-download-for-windows-10_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/robux-hack-me_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/minecraft-hacked-apk_GM479516143.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_off00003225.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3225	22876 bytes
SHA-256: `14b8b99fc4411873fb6dcb87efacd8030b50ed4b2bfe72e2c1ff2e3411463d75`
`font_01_sfnt_off0000659f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x659F	19372 bytes
SHA-256: `3fa24965bbd6c14cf65c0384a83a7b3c50beaeab0e826711de3fb3a5aaf1780d`

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