Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb57b0089bfac65…

MALICIOUS

PDF

40.8 KB Created: 2021-05-10 14:32:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3d9ea222f149d307fc89f43c00dcf289 SHA-1: f3e71d53efd6c13eba2671e637f60bd34f3f81ba SHA-256: 7fb57b0089bfac659b73fa1ab686e32efc25c8112f73d54d3379426520022168
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to malicious infrastructure, specifically a lure for 'free Robux' and game hacks. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9443

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 https://netcdn.xyz/app/431946152/free-robux-no-human-verification-or-survey-or-download-2021-game-hack In PDF document text
    • http://ferienwohnung-walker.de/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/free-robux-codes-no-human-verification_GM431946152.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_003_off00003e4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3E4B 25108 bytes
SHA-256: b1b507083df938e534ed63c08b8b92d8d59a280f9fd97d9b9a87e64ca23ee9f5
font_01_sfnt_off0000787d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x787D 20136 bytes
SHA-256: 66e5e50e12f5eb49621ab9bcd6ab85026409d616512a452c1eb3339dd9867554

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