PDF malware analysis — malicious · cef72a1f740f5ee9

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 11:23:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 5ca7a078aafa596d5b212e0d6d4524ed SHA-1: 8a09b00f3b95f5ee6e0cbb7bd8b44d38c4c984ab SHA-256: cef72a1f740f5ee9f006028fe175feb8d634d16695d138a42e470e2619591355

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector hosted at 'netcdn.tw', which is flagged as malicious. The document body and heuristics indicate a lure for 'free Robux' or game hacks, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to potentially malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

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.
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-robux-with-no-human-verification-game-hack In PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/rbx-claim_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/roblox-account-hack-app_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/ban-script-hack-roblox_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-to-get-free-robux-on-roblox-2021-android_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/daily-spin-and-coin_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/site-de-hacker-roblox_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-free-raid-link_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
`stream_002_off0000308b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x308B	23140 bytes
SHA-256: `0b3e8d9ab88358980d64f4a92fd60316995d798983a7d3b4294a7b776eacfb24`
`font_01_sfnt_off00006499.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6499	19700 bytes
SHA-256: `35e501b9c45e5927f0fc62a5ada2d4fbbc4f1128da3636f490de4bd32383e5b5`

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