Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b8d659cc0684c8…

MALICIOUS

PDF

29.9 KB Created: 2021-07-20 03:00:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: db4687e4a3b2eed449ff0215a2440765 SHA-1: b191ad32588f5bab9be4e97310c7de14b1114374 SHA-256: 21b8d659cc0684c846cfe7bb1b5ad77b55906c245b144f5e98a1a5e3ecca0185
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically a lure for 'free Robux' or 'game hacks'. The document body text and heuristic firings confirm the presence of these malicious redirector links. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0556

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-no-offers-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_off000020d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D2 22692 bytes
SHA-256: 6f6643bd1450688bdc47e567bb251ffb0eb315f2375598ae1b91b7b00ec9dff6
font_01_sfnt_off000053ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53AC 18200 bytes
SHA-256: 9667d64c08376f15d8cfb45c3aacba43ac1d421472699037c9c528d853194b66

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