Malicious PDF — malware analysis report

Static analysis result for SHA-256 453793f75c104949…

MALICIOUS

PDF

36.1 KB Created: 2021-05-17 23:46:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3e3b3c3c5bd75b1fd0bb306035a79a66 SHA-1: e6e6a8be4e7e10fe4a12d99b7a27c511c16029ea SHA-256: 453793f75c1049492d0aeadb54754108dae21042b804b46a94e50fc1ec74c339
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body and embedded artifacts further support this, with the URL https://netcdn.xyz/app/406889139/free-coin-master-spins-game-hack being a primary indicator of this malicious redirection attempt. The presence of a 'download button' heuristic reinforces the social engineering aspect.

Machine Learning

  • Nyx PDF Classifier clean score 0.0243

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-master-spins-game-hack In 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
stream_003_off0000324c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324C 25760 bytes
SHA-256: 9bca6bb817a395d7cc58e4ae4632f6762766ffe3300493d86bf55ccb009693d8
font_01_sfnt_off00006cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD1 17884 bytes
SHA-256: dbba0adc3b1b7bb8b2e5e51fec5d28ab169e2f7a165ed2a14d616932af559aea

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