Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d808c4727b62c0…

MALICIOUS

PDF

43.9 KB Created: 2021-05-12 11:14:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 61a6d7ca605cbdf3abd2e650d88f5076 SHA-1: 13fce80424585ac56054986c16d00e5a7e5c55fb SHA-256: a4d808c4727b62c054e070e100569120b880529d41b9393d70e4e824735ee4e8
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically disguised as a lure for a 'free generator / game hack'. The embedded URL, https://netcdn.xyz/app/406889139/free-coin-spin-coin-master-game-hack, is identified as malicious. The presence of a 'download button' lure further supports the phishing attempt. No scripts were extracted, but the document's structure and embedded URL strongly indicate a phishing campaign.

Machine Learning

  • Nyx PDF Classifier clean score 0.0115

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/406889139/free-coin-spin-coin-master-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003536.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3536 25656 bytes
SHA-256: 25a0bbd94b5e4675b200de7a146df7c8565c9b4244e0c16daa668d032dff0187
font_01_sfnt_off00006f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5A 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7940 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_03_sfnt_off00008b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B59 17884 bytes
SHA-256: 7cdd316e38b966dc4c029fefa3365f61ff88a2ebb5f677d1a08d60a6ba94bc95

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