Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7214ea8c822a9c…

MALICIOUS

PDF

40.7 KB Created: 2021-05-17 23:31:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d4d62b64ec9c20f0ad2a7008b2f84a34 SHA-1: 4ea59d9cf418a0c94d12e96bf13dc8f4bf85ed4c SHA-256: 5a7214ea8c822a9c4455cf7c2e008902ededf9781666ac246a10fef9867f7138
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a 'free generator' lure for Roblox. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-games-on-roblox-game-hack, is associated with malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to drive users to malicious sites, likely as part of a phishing or scam campaign.

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/431946152/free-robux-games-on-roblox-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_off000034cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34CF 25636 bytes
SHA-256: 4d2f5df302043942029499e03018183dc22f19a089a8399230caeb687125915b
font_01_sfnt_off00006fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEA 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00007cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFC 18576 bytes
SHA-256: 121d272924a8948b6bfdf19867642727f57edf659587de43eb46571e5003926c

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