Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8c520084530b1b…

MALICIOUS

PDF

40.0 KB Created: 2021-05-11 01:00:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a65814cc487f90b15966ba5104d13093 SHA-1: 1c60395939d9fa87a54231de3038bb971dd8217d SHA-256: 0d8c520084530b1b7f3d085fd9978717d7c39fcd40446a43bbc7692f5b0b7d83
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing indicating it links to a malicious redirector disguised as a 'free generator / game hack' lure. The embedded URL, https://netcdn.xyz/app/406889139/coin-master-free-spins-link-today-facebook-game-hack, is associated with malicious redirector infrastructure. Although no scripts were extracted, the PDF structure and the lure suggest an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

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/406889139/coin-master-free-spins-link-today-facebook-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_off000034d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34D0 25948 bytes
SHA-256: 986b095b39a6bac2b8df80353b21ce295984994dc37478e8f6d64160df9c841b
font_01_sfnt_off00007019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7019 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000079cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79CB 18568 bytes
SHA-256: 976bad0f84eadf36fe6397f68da5c043a767fda9c526d6325df07f5c92c7ef85

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