Malicious PDF — malware analysis report

Static analysis result for SHA-256 8856239eeab4e267…

MALICIOUS

PDF

42.4 KB Created: 2021-05-16 12:32:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 506af0d57234bab1b5ba9b51bc2ab115 SHA-1: 837d87a67885b6a0eba6a9a915da3859ff3ccb98 SHA-256: 8856239eeab4e267594c5d283e4b89c877f81c04dacd84bb904e787593bc7288
130 Risk Score

Malware Insights

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

The PDF contains multiple links and embedded text promoting a "game hack" generator, which is a common lure for phishing or malware delivery. The heuristic firings confirm that the PDF links to known malicious redirector infrastructure, specifically pointing to the URL https://netcdn.xyz/app/431946152/how-to-hack-robux-game-hack. While no scripts were explicitly extracted, the nature of the lure and the redirector suggests an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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/how-to-hack-robux-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_off000036c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36C9 29276 bytes
SHA-256: 14ad109bb8c3d4b9adc414483284721a6d656d7bff4bf90c5759335fde83a75c
font_01_sfnt_off00007a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A33 2824 bytes
SHA-256: bd082aa73fbb1a8b3bd2e5c998d3d8e31d1dfc71ea36f846af746f69a0d2ab7f
font_02_sfnt_off000083e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E7 18412 bytes
SHA-256: 799ae8847f356c5b4d712fc876b96dd84d848442331064266ecb6e470ae97e62

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