Malicious PDF — malware analysis report

Static analysis result for SHA-256 82611a5cf1df92da…

MALICIOUS

PDF

37.3 KB Created: 2021-05-25 12:06:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7711abe57cb81f4559033dc89863c96b SHA-1: 81728fff976f9c57e89c7fae8aa6bb0814c0ce21 SHA-256: 82611a5cf1df92dad978d8f466b44945c3d0d88a3481c55a34e9ad8cc96f4d84
210 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating a malicious redirector lure, specifically a fake CAPTCHA and a "free generator / game hack" theme. The embedded URL leads to a site impersonating Amazon, suggesting a credential phishing attempt. The document body, though partially corrupted, contains text related to 'Robux' and 'Roblox Generator', reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0076

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/how-to-get-free-robux-on-phone-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/how-to-get-free-robux-on-phone-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002bad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2BAD 25140 bytes
SHA-256: c2bf684adf3ea67205d165017d525d5496866c9454d9d02d3c8d96707ed6916f
font_01_sfnt_off000065b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B9 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00006f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7A 18600 bytes
SHA-256: 4aaa4dd608c1f398ea3b3714e579938e54c8b6ebc42d5b365d603cdfd05c4e85

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