Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a90540f1dfe1e2…

MALICIOUS

PDF

37.9 KB Created: 2021-05-17 04:01:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 533cbbf8ed6d2ca6e40bd9e53e0edfab SHA-1: 98fa115db99455e87e519ce08df8de83535f44c1 SHA-256: 01a90540f1dfe1e2a253ca2cc809c5dcd92143a0dcd2d5003e442f1585a7cee9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack'. The embedded URL, https://netcdn.xyz/app/431946152/robux-free-online-game-hack, is identified as a known malicious redirector. The document body also contains this URL and a call-to-action phrase, indicating a social engineering lure to trick users into visiting the malicious site, likely to download further malware.

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/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_off000031f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F0 28076 bytes
SHA-256: 29eed16e3dd80431a9d5d5ffa94ea2da4d1e7b25637675744819602ca0a16dac
font_01_sfnt_off0000734c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734C 18208 bytes
SHA-256: 9c6e6aa5efa9903ee4d2fc70532f13b8880c04837d913a4df075592e4b137fb6

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