Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b64313c4708df7e…

MALICIOUS

PDF

39.1 KB Created: 2021-05-21 15:33:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e7476ecb173c82752ce6d7855a265f87 SHA-1: 7a1cae6d5744c359906f6c5ac649ae15c1d8e315 SHA-256: 8b64313c4708df7ea8783dd790ada1596d9c4e8b00b139ea004873f055f8052a
180 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and links to known malicious redirector infrastructure, specifically advertising a 'free Robux generator' lure. The ML classifier also flagged this PDF as malicious. The embedded URLs likely lead to further stages of the attack, potentially downloading additional payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-downloading-apps-2021-game-hack In PDF document text
    • http://precisionheavyhaul.com/images/pokemon-go-free-40k_GM1094591345.pdfIn PDF document text
    • http://precisionheavyhaul.com/images/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://precisionheavyhaul.com/images/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://precisionheavyhaul.com/images/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://precisionheavyhaul.com/images/coin-master-free-spins-link-download_GM406889139.pdfIn 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_off000035d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35D6 26108 bytes
SHA-256: 006298ebd8eb84046d2bf1ee6ec49f295115c2e3ba72e083dcfc5f087e2a6c87
font_01_sfnt_off0000716a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x716A 20276 bytes
SHA-256: dfaf102e4a8660aec521ea97dbe5e1677fef1ca2e266cad45ab84be3fc58cd38

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