Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff38dde2c681c872…

MALICIOUS

PDF

31.8 KB Created: 2021-07-19 01:29:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 20d255b51a0a230d8fdf7732a56d458e SHA-1: 59ea1eeac660bd42b1ae634cd6ea8e5da57a3f1e SHA-256: ff38dde2c681c872f17fbd37eb40274bc49c4876eacd665bfe6477f087c1b0a3
160 Risk Score

Malware Insights

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

The PDF contains multiple links, including one pointing to known malicious redirector infrastructure. The document body and heuristics indicate a lure for a "free Robux generator", a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect the user to a malicious site, potentially for exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9469

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-generator-com-roblox-hack-game-hack In PDF document text
    • https://www.contabilidadesomma.com.br/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/coin-master-free-2021-spin-link_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_off000025df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25DF 22408 bytes
SHA-256: 3952d50424712fa898ce5fdc86ea1b8fab4cf33503fdd9df5e277093cb6c0ba7
font_01_sfnt_off00005809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5809 19036 bytes
SHA-256: e9298e23474107c7b84722852f71881d4055e6a131595fcbba005770bedde36b

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