PDF malware analysis — malicious · 50f83b23b2843f31

MALICIOUS

PDF

27.3 KB Created: 2021-08-01 04:53:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: aa0c826aed23d68c08a82f550f109251 SHA-1: 58ec63077c13e74f59a458d3343827704deab8d9 SHA-256: 50f83b23b2843f31981f29b50265f4aae0c1efa2cf9bcabe3346c545db9f451f

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising 'free spins' and 'game hacks'. The primary lure URL is http://netcdn.tw/app/406889139/100-free-spins-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a social engineering tactic to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

Heuristics 3

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.
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/406889139/100-free-spins-coin-master-game-hack In PDF document text
- http://e-learning.man3kotapadang.sch.id/__statics/gudangsoal/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
- http://e-learning.man3kotapadang.sch.id/__statics/gudangsoal/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
- http://e-learning.man3kotapadang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
- http://e-learning.man3kotapadang.sch.id/__statics/gudangsoal/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
- http://e-learning.man3kotapadang.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
- http://e-learning.man3kotapadang.sch.id/__statics/gudangsoal/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
- http://e-learning.man3kotapadang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
- http://e-learning.man3kotapadang.sch.id/__statics/gudangsoal/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
- http://e-learning.man3kotapadang.sch.id/__statics/gudangsoal/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://e-learning.man3kotapadang.sch.id/__statics/gudangsoal/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000319e.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x319E	23128 bytes
SHA-256: `c83199f7fa7d51b70df79966cc527e37c9195a06f39e0908328ef96d5cd26918`

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