Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08a3d1621d355d7…

MALICIOUS

PDF

30.1 KB Created: 2021-07-19 17:50:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8a69136c895e9c7a82bcef281439729f SHA-1: de6661e3609551086f484345a80a0d1ab1f331b5 SHA-256: d08a3d1621d355d7800e5f52d43d4ca30a65a2e1d26cd1b875068ee71773571c
130 Risk Score

Malware Insights

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

The PDF file contains a lure for 'Free Robux' and a prominent 'CLICK HERE TO ACCESS ROBUX GENERATOR' call to action. This link redirects to malicious infrastructure, indicating a phishing or scam attempt. The file's structure and content suggest it is designed to trick users into visiting a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier clean score 0.0560

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-without-human-verification-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000021a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A6 21248 bytes
SHA-256: a34bacfe8f10915cb0b73d74aae535e82df6819cbc208b99d563738ee21e8e18
font_01_sfnt_off00004fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBC 19812 bytes
SHA-256: 5b4e181d9a4435d0dbb05dc5edc73d8a1f896d56f758db28aef9602e53bf5b5b

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