Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8a32db50ab0f31…

MALICIOUS

PDF

34.3 KB Created: 2021-07-19 00:36:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 018873acb5721e34f576d5f6b03fc0ba SHA-1: 5f032c78681a2717ad910c9415cc3de7eb2d7323 SHA-256: aa8a32db50ab0f31ea112cbb2305cd0a3279d63418a9e0bc3de250c47c429348
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free generator / game hack' lures. These links lead to further PDF documents hosted on suspicious domains, suggesting a multi-stage lure campaign. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

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/406889139/free-spins-from-coin-master-game-hack In PDF document text
    • https://domoticaaplicada.com/images/robux-free-online_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://domoticaaplicada.com/images/freer-tiktok_GM835599320.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
stream_002_off000030d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30D9 23328 bytes
SHA-256: fcdd938c52f1e57677642fa767ef3e1d10dafabcc58f01b6cc653d73e1c7431d
font_01_sfnt_off00006536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6536 18148 bytes
SHA-256: a8179ab01d9f651dd6fb5ce3364ead5561884d8b40fe8a62eaf26fde05d0c646

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