Malicious PDF — malware analysis report

Static analysis result for SHA-256 52098a12b9e692a7…

MALICIOUS

PDF

37.5 KB Created: 2021-04-25 10:26:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d251f83f6a716bb5832542e250443815 SHA-1: eff0f26d3c385b4e2f1b45cf3e39c547fd8325c3 SHA-256: 52098a12b9e692a75fa62cef0c457f960ad41819d5c1fa4b5e932bf1b83b37ab
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for a 'free Robux generator' and embeds multiple links pointing to known malicious redirector infrastructure. The primary link, https://netcdn.xyz/app/431946152/free-5-bil-robux-game-hack, is identified as malicious. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to trick users into visiting malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-5-bil-robux-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_off0000366f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x366F 26352 bytes
SHA-256: e4d8427663573328a733cdb6539fb7c8b8172d2d8b67d40ce69100f3f7e09544
font_01_sfnt_off00007157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7157 18344 bytes
SHA-256: b5320b54872d7fef2d9d79e0afbbd62da4e83dfb229c6a2dab16339769947618

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