Malicious PDF — malware analysis report

Static analysis result for SHA-256 d483da3e841edb70…

MALICIOUS

PDF

26.9 KB Created: 2021-05-10 19:04:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 04421059165ff3181454fd89d00dc1e1 SHA-1: 3516b978dedfbae82c2c6ecdc4d8417cb4e3d49d SHA-256: d483da3e841edb70bc9180765492dbc296c9c4b53b912ee4f2ec3725d57adcb5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free Robux generators' and 'game hacks'. The document body reinforces this lure with similar phrases and a call-to-action. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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-generator-no-verification-game-hack In PDF document text
    • http://urezerv.com/images/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://urezerv.com/images/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://urezerv.com/images/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://urezerv.com/images/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://urezerv.com/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://urezerv.com/images/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://urezerv.com/images/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://urezerv.com/images/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://urezerv.com/images/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://urezerv.com/images/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://urezerv.com/images/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://urezerv.com/images/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://urezerv.com/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://urezerv.com/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://urezerv.com/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://urezerv.com/images/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://urezerv.com/images/how-to-hack-in-arsenal_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
font_00_sfnt_off00001db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB0 19100 bytes
SHA-256: 23d271092839e2b8761d1af2cff0f7b1c7e2454b03a46fda9bf6d2acf44b5070
font_01_sfnt_off00004554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4554 18600 bytes
SHA-256: fd611ad94f1c5362e5936d61a0ca6686a852f181e3b69dadbb107f1a26b259f7

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