PDF malware analysis — malicious · 5731118bf3e85265

MALICIOUS

PDF

45.6 KB Created: 2021-06-09 01:51:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 914edade49b2e4de4b7f9eb9b8f11839 SHA-1: 35542dc98074ff4155fe1a3bad5b813c94a7b241 SHA-256: 5731118bf3e8526572939c1a1a47ef1dc4d292b2c7ccd10ebf17c19dc08472ff

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, specifically advertising game hacks and cheats. The document body, though partially corrupted, contains a URL that aligns with the heuristic findings. The primary lure appears to be a fake download for game cheats, leading to malicious infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-kill-script-hack-game-hack In PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/how-to-get-wall-hack-roblox_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-robux-mod_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-accessories-roblox_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/minecraft-pe-hack-client_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_off00005318.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5318	26140 bytes
SHA-256: `08561b8d08dd5141cb734c509da97fe7e92e2e21bee75c2d5d1d37c1076519a2`
`font_01_sfnt_off00008eb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8EB7	18580 bytes
SHA-256: `6c9bd0677c406c79ce4a0d1ed764a989f9bfb3176b68673799c1a887714448ff`

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