PDF malware analysis — malicious · 137d406562d4d40f

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 17:08:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22

MD5: 217e35fdf45f82759da03350080af606 SHA-1: f9538b5ef81561e6055a648d08e9e454c807293b SHA-256: 137d406562d4d40f0565faecc0373908208931b69a35eee600424f820282f17d

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/406889139/install-free-game-coin-master-game-hack PDF link annotation
- https://loba.com.vn/public/upload/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/a-hacker-is-threatening-me-roblox_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/pubg-uc-18_GM1330123889.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/hack-coin-master-ios_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/uncopylock-free-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/freespinandcoin_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/hack-roblox-players_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-game_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/robuxian-hack-to-steal-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-promo-codes-roblox-robux-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-cheat-free_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-cheat-on-roblox-tycoons_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_off0000304b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x304B	22344 bytes
SHA-256: `c785d51c4e17d857ad2d2ffe7eba3512b1732310c43420dc78822d704281c8fb`
`font_01_sfnt_off000061e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61E4	18332 bytes
SHA-256: `d212333c85aa31425f07fcb274d9f5b35260b329917ccb36e51ab60c49de7971`

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