PDF malware analysis — malicious · a5dd212523995fe0

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 04:03:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 21abf373ea7dbfd93ab27cff4ac3eb3b SHA-1: ceccb22525570533ab5375c3e21752e97f98d425 SHA-256: a5dd212523995fe0f6e553ee23ee02f2944bf0b6559da60182000e39e809ab90

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

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.
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/hack-avatar-game-hack PDF link annotation
- https://vosco.vn/uploads/vosco.vn/files/roblox-free-gear-hack_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/roblox-star-wars-lightsaber-battles-free-level_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-robux-codes-no-download_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-minecraft-packs_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/filled-surveys-for-free-robux_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/roblox-phantom-forces-anti-cheat-bypass_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-crown-roblox_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-hack-tool_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-robux-no-inspect-element-2021_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-add-cheats-to-a-roblox-game_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_off000032fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x32FE	22184 bytes
SHA-256: `eb148e6cc446dbe2e3b3bfb45d1b03ec8b0a3c970b01f3a534370a018f172e25`
`font_01_sfnt_off000063e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x63E1	18292 bytes
SHA-256: `15fe832cb1a67f8b9b32bd16fa6b944b1b609e54d644db6923f8635996eddc7f`

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