Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8276174570e54f…

MALICIOUS

PDF

39.0 KB Created: 2021-06-11 06:54:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: de30ab04981669edabfa75a21f864834 SHA-1: 0e55b0f3a2bc9add0607d2483cd98a8d0d7bcc8c SHA-256: 6d8276174570e54ffe80d57ab8f1a0b8e85ae450da7046eebb1fad02d27ec452
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack lure, linking to a known malicious redirector. The embedded URL, 'https://netcdn.tw/app/431946152/how-to-hack-into-peoples-accounts-roblox-game-hack', is the primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest it's designed to trick users into clicking the link, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0331

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.tw/app/431946152/how-to-hack-into-peoples-accounts-roblox-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_004_off000038a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38A2 26372 bytes
SHA-256: bca67fa2cc00e14f40e9ebc28f91741c096c6ca489da9914da5a1edb6d96c6b3
font_01_sfnt_off000074f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F2 18920 bytes
SHA-256: cd6feab736d32fbc1966c6fb28c91be6b61306e37b6e68b34f9bb4d67deb9d6a

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