Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e78071f3898844…

MALICIOUS

PDF

37.7 KB Created: 2021-05-25 09:06:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 873f2b94cded6befe6f1bb2ecd1ab021 SHA-1: 7af10d61fb5609923a495e03a93fb00defa6d7df SHA-256: 90e78071f389884488fffeb9c84ae7aa2d8083cbe106a6c72b73804ff8d23604
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering 'free Robux' or 'game hacks', which are common lures for malicious content. The heuristic firings confirm these links point to malicious redirectors and a game hack lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious infrastructure, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-get-free-robux-no-scam-game-hack In PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/robux-earning-sites_GM431946152.pdfIn 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_002_off0000328a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328A 26696 bytes
SHA-256: 789ba1e70dd0a2a4306050a5a1324070353e6c2c6f03f878eb6c3367289a2951
font_01_sfnt_off000070a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A4 18768 bytes
SHA-256: d1f42346170e568709c452458a32d8325f9466b63e26828f6615071549d089d8

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