Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c45c77297a98ce9…

MALICIOUS

PDF

35.2 KB Created: 2021-05-25 09:37:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3b0d30b7d8e91bab4016b9538ac67839 SHA-1: 0432ef61725a8cd7e27d75e1acb9c1870498b3f6 SHA-256: 4c45c77297a98ce9c3a0d35d18e0ddf593f169fe96e52f98871aadb16b033c06
160 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors, masquerading as game hacks and generators. The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-hacks-game-hack, which is part of a chain of redirects hosted on huounaixunghe.com. The ML classifier also flagged this PDF as malicious, supporting the observed redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-hacks-game-hack In PDF document text
    • http://huounaixunghe.com/images/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/doctor-louie-roblox_GM431946152.pdfIn 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_002_off0000321a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x321A 24576 bytes
SHA-256: 92dc270cb2744c82d5a1b9d6db96e4e14eb10e1a33b7508a61cf513776ef70b3
font_01_sfnt_off000069f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F6 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

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