PDF malware analysis — malicious · adbb3bc4a5edcc7e

MALICIOUS

PDF

54.1 KB Created: 2021-06-07 05:24:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 6d97f4a8de078fc7cb2a71abf2fbf2e5 SHA-1: a9b107910505c37640523f27c3561e73a0a4ebdb SHA-256: adbb3bc4a5edcc7e3a304f12931dc52bffbc99237ee7d217c49c938ba8ab7670

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9636

Heuristics 5

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.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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 https://netcdn.tw/app/431946152/i-was-hacked-by-liepa20212021910-on-roblox-game-hack PDF link annotation
- https://nhaphangjapan.vn/public/upload/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-fan-club_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/pokemon-go-free-upgrade_GM1094591345.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/free-roblox-accessories_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/minecraft-free-app_GM479516143.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00004faf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4FAF	27228 bytes
SHA-256: `b56a93410068e4edfefadf94c1cbcb8c2faf91612f41518412ce5623a62108b4`
`font_01_sfnt_off00008f53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F53	9480 bytes
SHA-256: `32450853c2a587c9c6e6d0f210085934e506353eb4eb401095cd3f740e9a71ef`
`font_02_sfnt_off0000ad1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAD1F	19596 bytes
SHA-256: `3020c8c9ccb96961c9f139963ca3a2513b2d25626590645dd36992ce15054f5c`

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