Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a721536b83da5…

MALICIOUS

PDF

52.0 KB Created: 2021-05-21 09:14:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5ed446772134144edbec5efeff8bfbd7 SHA-1: 026744d2329c3d46d44f3d78ca112a931a00c686 SHA-256: 5b4a721536b83da5c39be61f34f2a9ac0e276f0cb386691d26d931dc3aa17bc7
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to known malicious redirector infrastructure at `https://netcdn.xyz/app/406889139/coin-master-free-coins-and-spins-app-game-hack`. The document body and heuristics indicate a lure for a 'game hack' or 'free generator', suggesting a social engineering tactic to trick users into visiting the malicious URL. No scripts were extracted, but the presence of embedded URLs and the nature of the lure strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3036

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-coins-and-spins-app-game-hack In PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/roblox-free-hats_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000038d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38D8 32788 bytes
SHA-256: c47530d77ff4fb9288203ab6fa900b5a752bf39f1b5a76f6b042a4087355b82e
font_01_sfnt_off00007e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6D 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off00008938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8938 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off00009c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5D 18060 bytes
SHA-256: f77ee24e01944806ea28e16fd73427a54f7109e241804df06ce657d8c6d11cfb
font_04_sfnt_off0000bdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB3 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0