Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b7ea6cffbb2561…

MALICIOUS

PDF

42.6 KB Created: 2021-05-10 16:00:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b39d06271ff857b71a1e5d510a4b5cae SHA-1: 67213a4341dd65480227771fc51c8b91a2b27afc SHA-256: e7b7ea6cffbb25610355c6bdf600d9f5b38a0f7b9509f5299cfe41bbbacb4db9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a "free generator / game hack" lure for Coin Master. The embedded URL, https://netcdn.xyz/app/406889139/como-hackear-coin-master-2021-espaol-game-hack, is associated with known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to redirect users to a potentially harmful site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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/como-hackear-coin-master-2021-espaol-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_off0000391e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x391E 25124 bytes
SHA-256: e74eb8fc251b23afc12acb145f3b1f3784f7fb451b689f5842959651fad62e33
font_01_sfnt_off00007251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7251 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off0000846a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846A 18628 bytes
SHA-256: 51d0c26a7700976d4b9729d2086435caf3cf2216ab56e6e35ff28649202ea5db

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