Malicious PDF — malware analysis report

Static analysis result for SHA-256 66097a112319d671…

MALICIOUS

PDF

39.0 KB Created: 2021-05-12 07:02:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6d715a08fc55657927105547c442a4a6 SHA-1: 77c64305998ef53f2415e046dc347fb08fee0304 SHA-256: 66097a112319d6716491f7c3b15cb48d676cc1fd74724acf6e1231dd7fa212a2
130 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically disguised as a "free Robux generator" or "game hack". The embedded URL, https://netcdn.xyz/app/431946152/free-robux-codes-no-verification-2021-game-hack, is flagged as malicious. The document body also contains a call-to-action phrase, reinforcing the lure.

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-robux-codes-no-verification-2021-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_off0000360c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x360C 27560 bytes
SHA-256: da680244fd87cab6a9d4703f18447325313e96aef19acddbc666f5f607cf560a
font_01_sfnt_off0000745d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x745D 19176 bytes
SHA-256: db1e34f64d78c47646929d75ef8e7d82dfccacc985d29653851fea35b3c0bf96