PDF malware analysis — malicious · 43fe2bc28af524ec

MALICIOUS

PDF

35.0 KB Created: 2021-06-30 06:19:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: d549b611f207646d77655964566f9e4b SHA-1: 582b4283c529b07cd79d279efa973571e7b67327 SHA-256: 43fe2bc28af524ec5b1a56f48a69dd12f352dd3e1aca150cf11e1b52a475e66a

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a malicious redirector link disguised as a 'free generator / game hack' for Roblox, impersonating Microsoft. The link, http://netcdn.co/app/431946152/free-roblox-hats-no-model-game-hack, likely leads to a credential phishing page or a download of a second-stage payload. The malformed stream length heuristic and ML classifier further indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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: http://netcdn.co/app/431946152/free-roblox-hats-no-model-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 http://netcdn.co/app/431946152/free-roblox-hats-no-model-game-hack In PDF document text
- https://www.yantan.com.tw/upload/files/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/how-to-hack-roblox-to-get-infinite-robux_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/how-to-get-hacks-on-roblox-streets_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/robux-hack-tools_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/where-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/unlimited-robux-hack-pastebin_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/roblox-hack-cheat-engine-mac_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/script-for-teleporting-in-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/hacked-clients-for-roblox_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.yantan.com.tw/upload/files/coin-master-free-spins-no-survey_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_off0000316a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x316A	22520 bytes
SHA-256: `f00536cdf23e34c404c91c36bb5ef7f29416eff1b23ca905bfcda7c8d554942b`
`font_01_sfnt_off000063b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x63B3	19124 bytes
SHA-256: `6867c649e86b0112b151b21a7c6e05f927bba7a062bba3a3a816d8ba792f1890`

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