Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd75ba47f1faf2d5…

MALICIOUS

PDF

27.6 KB Created: 2021-07-05 16:17:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b7216fd3cb5902b01a43ea5021cbaa6a SHA-1: 6a8051d844ebb411044e4de5ac9cebffddb4f31e SHA-256: dd75ba47f1faf2d530f5d893c7349646e6beeb7e57577f6ee996e2d6b80c500d
130 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it links to a malicious redirector disguised as a 'free Robux generator' lure. The document body, though partially corrupted, contains text related to 'Robux' and a call to action to access a generator. The embedded URL is known to be associated with malicious redirector infrastructure, suggesting an attempt to lead the user to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-fast-and-easy-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
font_00_sfnt_off000016b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B4 21892 bytes
SHA-256: d160ead5aa16abda705d8526966f88cec9fdb192eec8e13b35d7456e438571d6
font_01_sfnt_off0000474c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x474C 19340 bytes
SHA-256: e9e0cf1ab6f783e57183aba6e7ab34e8b0edef29a09b47d1de428d0435b690df

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