Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d404f4b7f8f7b8…

MALICIOUS

PDF

41.5 KB Created: 2021-05-16 10:05:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 12c01b3f0f4c4cd4e3cae90ed8cadec4 SHA-1: bbede35801038b07f1a897395753f3ae1f32c1cf SHA-256: 05d404f4b7f8f7b81dd4e020ed7b4ca6ce2fb5aa1f2fa555b5b439dc3d24cbc1
170 Risk Score

Malware Insights

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

The PDF contains a lure impersonating Facebook, promising free Robux and directing users to a malicious URL. This URL is associated with known malicious redirector infrastructure and is designed to trick users into providing credentials or downloading further malware. The document body, though partially corrupted, contains the malicious URL and text related to the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

Heuristics 5

  • 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.
  • 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-earn-robux-for-free-2021-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-earn-robux-for-free-2021-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_003_off000031ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31EC 27648 bytes
SHA-256: c6087d00a82d7c91a56e1445e3fd2ce8c01c2dc450c18e1ee293b5a7b653db70
font_01_sfnt_off00007226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7226 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00007f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F38 18808 bytes
SHA-256: 177d88bc60daff4309aceb58336b2ba1d1983158bcd2aa353c0aa46f075a8142

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