PDF malware analysis — malicious · 21d340b5d8253c75

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 17:25:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 824c03fe9f4fd9437d567cddb801f992 SHA-1: 085295113e0dd3cf70ae13cf22f0329e2bd15fcc SHA-256: 21d340b5d8253c75c10492266bd9773872f4a55425529f3a21963c4241f435fe

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free currency to trick users into clicking malicious links. The primary link, http://netcdn.tw/app/431946152/roblox-royale-high-diamond-hack-game-hack, is identified as a malicious redirector. The document's content and embedded URLs strongly suggest a phishing or scam campaign aimed at users interested in online games.

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/roblox-royale-high-diamond-hack-game-hack In PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/free-robux-codes-march-2021_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/websites-to-earn-free-robux_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/pison-club-roblox-free-robux_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/free-robux-computer-2021_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/hiw-to-get-free-robux-on-roblox-2021-bfast_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/free-panda-mask-roblox_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/coin-master-game-download-free_GM406889139.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/roblox-luac-scripts-for-lvl-hack-shinobi-life_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/2021-fly-hack-roblox_GM431946152.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
- https://www.serraw.com/uploaded_files/userfiles/files/free-robux-no-human-verification-and-no-survey_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_off000031e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31E8	22572 bytes
SHA-256: `138d12926eff8f8dd1ecc0836210310002d8bf541eaa38575e33d7d5b86c4e9c`
`font_01_sfnt_off00006422.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6422	19724 bytes
SHA-256: `1a67ae04acdcf9bb6160b94dd58735b3f7a5fd1d5d3840fc5372402fae40359c`

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