Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c65e6532a2fe25…

MALICIOUS

PDF

32.7 KB Created: 2021-07-29 23:31:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2f73b9b401e2409e300e0534e364edfd SHA-1: a800f7e1ba18cab7396c72ec16eb90ae4a0f20a5 SHA-256: d0c65e6532a2fe2532d98da350ed293db695e94aff3287092c8c72d49b1bc3f4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a malicious redirector at http://netcdn.tw/app/431946152/free-robux-no-download-game-hack, which is disguised as a game hack lure. The presence of multiple embedded URLs and the critical heuristic firings strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful content. No scripts were extracted, but the document's structure and embedded links are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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-no-download-game-hack In PDF document text
    • https://www.contabilidadesomma.com.br/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/free-modded-minecraft-server_GM479516143.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_off00002b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B3F 21852 bytes
SHA-256: 5dc80aa4fd78f59209dcfb408074dee78fb85be8b285f42d23425ea6663bcd92
font_01_sfnt_off00005b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B64 19008 bytes
SHA-256: 72e3a65839c32bde970c5e9c108b6cdefe5a1e283205e2ba54e9e9ddd761828c