PDF malware analysis — malicious · eb6213c2183ed8c0

MALICIOUS

PDF

44.0 KB Created: 2021-06-09 08:04:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 293d08a818f8af721cd5641d63ac4918 SHA-1: 91b3f82b2222b9f22b0aa27dabc2aa5277e288a6 SHA-256: eb6213c2183ed8c0ba4df29b66e93cb6878d5479ffbee63b16cf956ed7fbda72

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a malformed stream and links to known malicious redirector infrastructure, specifically targeting users with lures for 'free generator' or 'game hack' content. The primary malicious link identified is https://netcdn.tw/app/431946152/roblox-escape-games-free-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to exploit vulnerabilities or redirect users to potentially harmful sites, likely as a precursor to further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

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.
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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.tw/app/431946152/roblox-escape-games-free-game-hack In PDF document text
- https://www.e-learningmin10jakarta.com/__statics/gudangsoal/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
- https://e-learningmin10jakarta.com/__statics/gudangsoal/files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
- https://e-learningmin10jakarta.com/__statics/gudangsoal/files/roblox-lawsuit_GM431946152.pdfIn PDF document text
- https://www.e-learningmin10jakarta.com/__statics/gudangsoal/files/roblox-free-online-game_GM431946152.pdfIn PDF document text
- https://e-learningmin10jakarta.com/__statics/gudangsoal/files/coin-master-free-online-game_GM406889139.pdfIn PDF document text
- https://www.e-learningmin10jakarta.com/__statics/gudangsoal/files/coin-master-ios-hack_GM406889139.pdfIn PDF document text
- https://www.e-learningmin10jakarta.com/__statics/gudangsoal/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://e-learningmin10jakarta.com/__statics/gudangsoal/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
- https://www.e-learningmin10jakarta.com/__statics/gudangsoal/files/easy-robux_GM431946152.pdfIn PDF document text
- https://e-learningmin10jakarta.com/__statics/gudangsoal/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
- https://e-learningmin10jakarta.com/__statics/gudangsoal/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
- https://e-learningmin10jakarta.com/__statics/gudangsoal/files/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
- https://www.e-learningmin10jakarta.com/__statics/gudangsoal/files/earn-free-robux_GM431946152.pdfIn PDF document text
- https://www.e-learningmin10jakarta.com/__statics/gudangsoal/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
- https://e-learningmin10jakarta.com/__statics/gudangsoal/files/free-free-robux_GM431946152.pdfIn PDF document text
- https://www.e-learningmin10jakarta.com/__statics/gudangsoal/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.e-learningmin10jakarta.com/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
- https://e-learningmin10jakarta.com/__statics/gudangsoal/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
- https://www.e-learningmin10jakarta.com/__statics/gudangsoal/files/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
- https://e-learningmin10jakarta.com/__statics/gudangsoal/files/is-there-a-way-to-get-free-robux_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_off00004ec1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4EC1	25652 bytes
SHA-256: `f9d2b403e35c62e36fe79de9152dadbac3b43371b68811750ca2a6f3434a2a99`
`font_01_sfnt_off00008876.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8876	18612 bytes
SHA-256: `3573c5d8aace07d4dd28b88e689f74f7a372598ba2e1f62e4ba26c9c9ab54cff`

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