PDF malware analysis — malicious · 89031e5054bf3fdc

MALICIOUS

PDF

35.6 KB Created: 2021-07-06 04:27:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05

MD5: 258a0eaeeb8eb33bb3795ae293c0e1d0 SHA-1: 818e3ba05b4dafa513bc6cc6848d2acbb45f74ec SHA-256: 89031e5054bf3fdc4dff17cd526bacdb92b86c82c14ed0e78cd3b341390b5183

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous external links, many pointing to game-related hacks and generators. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a malicious link farm designed to redirect users to potentially harmful sites or download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 6

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
PDF links to a 'free generator / game hack' redirector high 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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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
External URI info PDF_URI

PDF contains an external URL action
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-limiteds-roblox-game-hack PDF link annotation
- https://cheryco.ir/assets/public/js/uploading/files/roblox-arsenal-hacks-for-mobile_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/roblox-play-online-for-free-no-download_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/roblox-hack-gui-tutorial_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-robux-on-robux-store_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/wie-kann-man-in-roblox-hacken_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-use-pabestin-codes-hack-roblox-dungeon-quest_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/image-veste-army-free-roblox_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/fast-robux-online_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-do-you-hack-roblox-ultimate-driving_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_off000032fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x32FB	22708 bytes
SHA-256: `905d92637819708d7514eb301deda14522a65625b9c9d46c6eb8976fdc9c369c`
`font_01_sfnt_off0000659f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x659F	19308 bytes
SHA-256: `ef1db6cc5fb2204fb8780ff958a50961dd9e8bc3f71ddcecfb9ff46bf26270b6`

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