Malicious PDF — malware analysis report

Static analysis result for SHA-256 220956839473cda9…

MALICIOUS

PDF

37.4 KB Created: 2021-05-13 06:11:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 27bb6217bb95b0335c3e83763c93af45 SHA-1: 836b0d0876b04786c64e382d4a97c2556b4cc879 SHA-256: 220956839473cda9195818beb36850d7c6e7b70a3a1c91eb52d79835030e8328
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'Coin Master Free Spins' and includes a critical heuristic firing for a malicious redirector link. This link, 'https://netcdn.xyz/app/406889139/coin-master-free-spins-links-2021-game-hack', is known to lead to malicious infrastructure. The document's structure and embedded content suggest an attempt to trick users into visiting this malicious URL, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-links-2021-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_off0000355b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x355B 25920 bytes
SHA-256: d8b05091ff7ebe688cb6e73b374b9efc54b3c35ca00b0822ff3b02031fa8f393
font_01_sfnt_off00007073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7073 18456 bytes
SHA-256: 405c435adaafa0da304b7a4986d8f56c56dc87ed278d5cff2ac0c57977d8d7e3

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