Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9b2a848cfdd75f…

MALICIOUS

PDF

40.5 KB Created: 2021-05-12 20:19:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 99ea04bcd2f109cffde87d6fc0a89cff SHA-1: 3ee4df181b09d5151a27a7dec7a942409cc31237 SHA-256: 9c9b2a848cfdd75fc4712f28a67328c58a4b3ad171231ecb8a0bcb61328826c8
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a "free generator / game hack" for Minecraft. This link, https://netcdn.xyz/app/479516143/can-i-get-minecraft-windows-10-for-free-game-hack, is known to lead to malicious infrastructure. The document body also contains similar text and a call-to-action, reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and the nature of the link suggest it's designed to exploit user interest and lead them to a malicious download or phishing site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/479516143/can-i-get-minecraft-windows-10-for-free-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003671.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3671 26028 bytes
SHA-256: 1892c49811b3f1a50e889a6379ec53238a83f83594f66ed9e11755e5532cd8dc
font_01_sfnt_off00007244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7244 2892 bytes
SHA-256: c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
font_02_sfnt_off00007c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2D 18524 bytes
SHA-256: 6ac3bcb80c7412b4530c4d4c769bc132649d8002d05e49718f259242a5c40259

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