Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c5c9b688fda224…

MALICIOUS

PDF

29.9 KB Created: 2021-07-18 23:15:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ba31d8d854d4cd2ca831c2e41ba2fec6 SHA-1: ac5f6580b156236b7c6d73677c0c6079fb006ee8 SHA-256: 18c5c9b688fda2246cdf509d4c79f0d0a7943616b131589b15f48f125fc41fe2
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that point to a known malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The document body, though partially garbled, reinforces this lure with phrases like 'Free Robux Websites That Actually Work 2021' and 'CLICK HERE TO ACCESS ROBUX GENERATOR'. The primary heuristic firings indicate a redirection lure to malicious infrastructure, suggesting the PDF's purpose is to trick users into visiting a harmful site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0573

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-websites-that-actually-work-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D18 22100 bytes
SHA-256: 27a92c05d12d4655d6d8a5525047729d62b427bd7648bcaf64e46c3547a062c1
font_01_sfnt_off00004e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E75 19840 bytes
SHA-256: 415b7ee37fda4fc7e840ae839cc984cb2b4a0b95548347be2336140620e9a02b

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