Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b309a2cc257d367…

MALICIOUS

PDF

39.0 KB Created: 2021-05-17 08:00:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 19414425c3f38cf338bdaaca0b8f2762 SHA-1: d27caf7ccd26bd4b69c4677456be5fec0d38d226 SHA-256: 3b309a2cc257d3674c013d0b9d24dc96fc266caf5cb953a2925b65b02efe4b99
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically promoting a 'free generator / game hack' lure. The embedded URL, https://netcdn.xyz/app/431946152/how-to-hack-to-get-robux-game-hack, is identified as malicious. The document body also contains similar text and a call to action, reinforcing the phishing attempt. While no scripts were explicitly extracted, the nature of the lure suggests a potential for further malicious activity upon clicking the link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/how-to-hack-to-get-robux-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003200.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3200 25260 bytes
SHA-256: 5d08ab5df8c035421274a1bd846576c7fe8303cb5db75509f81f1ac5364329bb
font_01_sfnt_off00006c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C17 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off000075d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D9 18516 bytes
SHA-256: e2a97b64806b22db336191728b408e5b7179700d4ee5fd3b4b30addea2706a3c

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