PDF malware analysis — malicious · 8191af0acfe7d304

MALICIOUS

PDF

45.9 KB Created: 2021-06-02 14:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22

MD5: 46798d28cb81d63f4dc893b0948cc4dd SHA-1: e35ff7b4aad14c8298b435eab7934ef9cb9048f2 SHA-256: 8191af0acfe7d304af20c4a2e1964474a3af9d1a96e77d9c44bb81606edbd7d5

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a fake CAPTCHA lure to trick users into clicking a link, which is a common social engineering tactic. The embedded link directs to a known malicious redirector infrastructure, likely serving as a gateway to a second-stage payload. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to exploit vulnerabilities or deliver malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9864

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.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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.xyz/app/431946152/free-robux-script-2021-game-hack In PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/roblox36com-free-robux_GM431946152.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/spin-link-coin-master_GM406889139.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-hack-tool_GM406889139.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/minecraft-xray-hack_GM479516143.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/free-robux-websites-2021_GM431946152.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/robux-come_GM431946152.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/bux-life-free-robux_GM431946152.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/free-roblox-codes_GM431946152.pdfIn PDF document text
- http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-hack-without-verification-for-iphone_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_004_off00005160.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5160	27776 bytes
SHA-256: `54d9d62332c2a3c5ed46688b8fbd45861e7dd37d39ebce54382ba91b15b6a367`
`font_01_sfnt_off00008f35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F35	18816 bytes
SHA-256: `618faae8a74a198a7d802438d34489e5ce0f2a38dedb8431505b1a75f3bd260e`

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