PDF malware analysis — malicious · 3c6f68fa04b1dc92

MALICIOUS

PDF

42.1 KB Created: 2021-05-13 07:05:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 30705aebcceccadbf3130af7813eee52 SHA-1: d1391140c9cdca40378322ae8786f8e02fc3a6a1 SHA-256: 3c6f68fa04b1dc92078417504b12ee8bd2711b15cafaea30756c8e426c5355b9

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA and lures related to game hacks and free currency to deceive users into clicking malicious links. The primary malicious link, https://netcdn.xyz/app/431946152/best-way-to-get-free-robux-game-hack, is associated with redirector infrastructure and brand impersonation, specifically Amazon. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction, likely leading to further malicious content or downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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
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: https://netcdn.xyz/app/431946152/best-way-to-get-free-robux-game-hack.
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/best-way-to-get-free-robux-game-hack In PDF document text
- https://www.croydex.com/uploads/files/files/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/coin-master-hack-355_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/get-free-robux-now_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/100-hack-coin-master_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/roblox-hack-app_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/how-to-get-free-robux-without-verifying-2021_GM431946152.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_off00004827.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4827	24548 bytes
SHA-256: `94589562faa6b2880b59f58d52af97a5a9a6f34e79ad3570611d67eae11bac45`
`font_01_sfnt_off000080a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x80A7	18724 bytes
SHA-256: `0e67c697191027b8b448214b8413bf6f3ed0ff1165507b95d6a34aabcad7a82f`

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