Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3a3fd45d417a7e…

MALICIOUS

PDF

48.6 KB Created: 2021-05-18 00:37:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4731b59436cb4010297406ff05c536ff SHA-1: 099da8099609a63d762b12e3e6d6d97d0b30c1d8 SHA-256: ca3a3fd45d417a7ee93516d1d93cd0c34d9c76673e29067aa6e311eca7d9ffb0
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body, though partially corrupted, contains text related to 'Free Spins' and a call to action to 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the lure. The embedded URL is the primary indicator of malicious intent, likely leading to a second-stage download or exploit.

Machine Learning

  • Nyx PDF Classifier clean score 0.0146

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-spins-game-hack In 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_003_off000035d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35D0 26136 bytes
SHA-256: be5b181eb18b9fbcb057bb9c974f06ac3f737d0160ad0d96f55648ed72787d97
font_01_sfnt_off000072db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72DB 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off00007da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA6 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off000090cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90CC 17412 bytes
SHA-256: 6c1c32b97f4bf65551242dd1dc58e8e825ad8a01d5ccf0df5c631e6ff61c0786
font_04_sfnt_off0000afed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFED 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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