Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8d96c4cc723f79…

MALICIOUS

PDF

28.0 KB Created: 2021-07-04 00:18:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3adbf6d68bff470e5732c651ca84f955 SHA-1: 78c1f3e7136d7db085dff1f9d281cb3e4691bc87 SHA-256: 4a8d96c4cc723f79550c5a84778c1d5efaf42a6c7151c5d4504303e83bbf4907
130 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'Robux generator' and a link that redirects to known malicious infrastructure. The embedded URL 'http://netcdn.tw/app/431946152/how-do-u-get-robux-game-hack' is identified as a malicious redirector. The document's content and heuristics suggest an attempt to trick users into visiting a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

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/how-do-u-get-robux-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_off000016c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7 22924 bytes
SHA-256: 421a908c81481df50a0f9ccb402ebb136e9114401ca96f1c25e092c046b6e800
font_01_sfnt_off000049ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49EE 18988 bytes
SHA-256: 62d04ddf0f3dc7e4076f7b6dcac6ca1e5fdd754dcdc61d7a43a0a000b84b24d7

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