PDF malware analysis — malicious · 8aa1daf62e60ff13

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 16:43:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 450cc5af0061bb76d6adf0913b37c294 SHA-1: 5888c5b0beb3bae07c4f268be17c341601379481 SHA-256: 8aa1daf62e60ff136e25dc43f9805a426b8a0fe2a9e49beaf130d56e406d3700

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a malformed stream and links to known malicious redirector infrastructure, impersonating Microsoft to lure users with a "game hack" offer. The primary malicious link is https://netcdn.tw/app/431946152/invisibleble-hack-roblox-wearedevs-game-hack, which likely leads to a further exploit or phishing page. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9890

Heuristics 6

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.
Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/invisibleble-hack-roblox-wearedevs-game-hack.
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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/invisibleble-hack-roblox-wearedevs-game-hack In PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/roblox-sword-fighting-tournament-hack_GM431946152.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/demon-roblox_GM431946152.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/tiktok-free-hit_GM835599320.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/coin-master-levels_GM406889139.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/coin-master-homepage_GM406889139.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/how-to-get-free-clothes-on-roblox-ipad_GM431946152.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/speed-hack-roblox-script_GM431946152.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/free-pokemon-go-accounts-level-30-2021_GM1094591345.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/try-coin-master-hack_GM406889139.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
- https://pt-mataram.go.id/perpustakaan/repository/coin-master-free-spins-ios-app_GM406889139.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_off00005567.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5567	25512 bytes
SHA-256: `61468657dd537611bcaf25d48395db8a8530bdc475d5a9f97122e6c6c386d32a`
`font_01_sfnt_off00008fe4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8FE4	18788 bytes
SHA-256: `acc30946234c257017090dcfb0bf9217614d55d6771698a6af534acffed4fc71`

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