Malicious PDF — malware analysis report

Static analysis result for SHA-256 c604f130765768d7…

MALICIOUS

PDF

36.6 KB Created: 2021-05-19 14:36:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0ee9ce63fa4bf53535cca9ea46fae784 SHA-1: 25454b94eb6ddb033cdac9efc7e4cdf4b11d855b SHA-256: c604f130765768d7a4e7a6dcc9ae2d7dbee23067dfa89acc576bb8ca648c9c51
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains text and embedded links that lure users with the promise of "free Robux" and "game hacks." It directs users to a malicious URL, https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-2021-game-hack, which is flagged as a known malicious redirector. The presence of a "download button" heuristic further supports the malicious intent of tricking users into clicking the link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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-do-you-get-free-robux-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_off000031c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31C8 25084 bytes
SHA-256: cd7975218212ecf3e4f841385edbc6725a6a09add8423b9d5ae1d5c949719737
font_01_sfnt_off00006b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5F 19016 bytes
SHA-256: 7afc4835c6f8d200a546e15f78f642ba5dd88c8fac7df04bc3003dd1e9f7232a

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