Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64fdc8120576e0c…

MALICIOUS

PDF

37.5 KB Created: 2021-05-10 10:37:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 68d4fd53b53bf48aeba438a3f2b29275 SHA-1: f39c97cf3da1ebb0c678b5ab2ae62691bb9a26b0 SHA-256: b64fdc8120576e0c3a02e9b60030bae081edd878cb4e51ed84929bc4b11a2044
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically referencing a 'free generator / game hack'. The embedded URL, https://netcdn.xyz/app/406889139/how-to-create-group-in-coin-master-free-spins-game-hack, is flagged as malicious and part of a redirector chain. The document body, though partially corrupted, contains text related to game hacks and generator tools, reinforcing the lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier clean score 0.0313

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/how-to-create-group-in-coin-master-free-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_off000032e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32E7 29652 bytes
SHA-256: c65489d5b98deea67fd71dc9711effeb180e152118e55f146c4672021342284c
font_01_sfnt_off000071c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C2 18188 bytes
SHA-256: 214f541c49ef2ca421d67462486d7476b6aace0078e47079ad7f1e2427fd8839

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