Malicious PDF — malware analysis report

Static analysis result for SHA-256 48315f2bb7f0a632…

MALICIOUS

PDF

40.8 KB Created: 2021-05-10 10:35:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4e4abc707a20ec11a8403e89121b9f70 SHA-1: cbd707556a6825ea9e8f6c1f75a7d2256e10adae SHA-256: 48315f2bb7f0a6327278b904e01e78651c50781caeb8db5f1f71cf23f8ddb8ba
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a 'secret recovery' lure, indicating it attempts to trick users into revealing sensitive information. It also links to a URL associated with game hacks, a common pretext for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a social engineering attack aimed at credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-facebook-page-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003247.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3247 24908 bytes
SHA-256: 78deb518dc5f2a62f91894240d06866716077fd92631b2b584e6ca89207e017d
font_01_sfnt_off00006b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7E 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off00007d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D96 18480 bytes
SHA-256: c2031f29028d316a525723dce25d37222f39d47c7f71c2e87d16e38bd1d84d97

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