Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78bcea53a6c7bf6…

MALICIOUS

PDF

31.3 KB Created: 2021-07-20 02:33:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4ecaf23d36349e9c208921bcee0beb9b SHA-1: 2e7fb09aa1bae1943905e930e77a7e4308a0b703 SHA-256: e78bcea53a6c7bf681d70a67e17a3b2595366436bbabdd24d69def9279663dee
130 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a known malicious infrastructure, specifically advertising a 'free Robux generator' with no human verification. This lure is designed to trick users into visiting a potentially harmful website. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0580

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-to-get-free-robux-no-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
stream_002_off00001f57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F57 23628 bytes
SHA-256: fc501b127788cee38a443ebac4ee6ca48965692364f6199ba90ddac02cfeb14e
font_01_sfnt_off000054d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54D3 19612 bytes
SHA-256: ff581dd288a9de72e14bfd7e10fefbba6bd57b51cdd2136abe9d7c19537915f7

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