Malicious PDF — malware analysis report

Static analysis result for SHA-256 1408f03d69f7450a…

MALICIOUS

PDF

34.2 KB Created: 2021-07-21 04:17:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5fc640b439570b9e931cc7ee6b54afa8 SHA-1: 081c02dbe1cd98a61718cfcbab33bd2fed5a35ea SHA-256: 1408f03d69f7450a33e86bc20a6aa804c5c6c666d885eca05b61886340105f88
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising 'free game hacks'. The primary link directs to http://netcdn.tw/app/431946152/how-to-get-free-robux-hack-game-hack, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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/how-to-get-free-robux-hack-game-hack In PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/you-promised-my-son-free-robux_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_off00002eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EEA 22952 bytes
SHA-256: 3bf742cfeb618133a49271de7a0d9033afa7b76aab72fab4f0a7317d6b713160
font_01_sfnt_off000061f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 18868 bytes
SHA-256: f1cdf876f91d9e30da1238ee6bc5322a54fb60d0a8e12f5fc7ae71cdf41b6736