Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bae21f662659a5…

MALICIOUS

PDF

35.7 KB Created: 2021-05-13 08:01:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 11831470b4448b6672e2101a0f914690 SHA-1: 0bc8ca14280015517ee6bfc8df835f91344ac27d SHA-256: d8bae21f662659a5b1e881c404988e461ef6a202306057c1d30e8956409ea46b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure related to 'Robux Free Online' and a clear call-to-action to download a generator, which is a common tactic for phishing or malware distribution. It contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://netcdn.xyz/app/431946152/robux-free-online-game-hack', indicating a high likelihood of malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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/robux-free-online-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_003_off00003275.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3275 24368 bytes
SHA-256: 6f97e11d009c35dc3b98426bdc2166a3403911d7cdf72ee9ce0614da761d3e55
font_01_sfnt_off00006a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A70 18208 bytes
SHA-256: 9c6e6aa5efa9903ee4d2fc70532f13b8880c04837d913a4df075592e4b137fb6

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