PDF malware analysis — malicious · 2bd7fc20c93bb731

MALICIOUS

PDF

36.6 KB Created: 2021-07-07 12:59:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 44ec4e3f9e0b06a43c1d0cf04e9520c9 SHA-1: 08288116b4fab689168cb7dbb95234a5c9a79d94 SHA-256: 2bd7fc20c93bb73140139e0b235335aa9cd0e3280c32b5d699c47fdf9f8a6ac1

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a lure for free game currency or accounts, directing users to a malicious redirector. The document's structure indicates it was generated by wkhtmltopdf and contains malformed streams, suggesting exploitation. The primary malicious link is http://netcdn.tw/app/431946152/free-roblox-accounts-with-robux-that-work-not-banned-game-hack, which is flagged as a known malicious redirector.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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.
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.tw/app/431946152/free-roblox-accounts-with-robux-that-work-not-banned-game-hack In PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/earn-robux-com_GM431946152.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/worst-client_GM479516143.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/hack-vip-roblox_GM431946152.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/android-coin-master-hack_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/how-to-get-free-clothes-in-roblox-on-phone_GM431946152.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.min2kotamalang.education/__statics/gudangsoal/files/tiktok-minecraft-hacks_GM479516143.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_off000035e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x35E1	22512 bytes
SHA-256: `bd95b004c848ba0c98478748cca3383e16a89c76d60894995a6521a07e27a95d`
`font_01_sfnt_off00006835.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6835	19720 bytes
SHA-256: `e7aa0a474f873a6e751f5083720d35e515444fa97241f03d9058db0775c81672`

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