Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2b1e4817e24a72…

MALICIOUS

PDF

39.6 KB Created: 2021-05-22 03:14:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: eb18c5cf25174f2d9b7311c68f9187df SHA-1: 9ab01e00bf2329410ca4b8948902e7f18449b17e SHA-256: db2b1e4817e24a720191c12851c22855f3744b1323fcd73586ab3675be0503b5
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically advertising 'free Robux' or 'game hacks'. The heuristic firings confirm these links point to known malicious redirectors and lures. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest it's designed to trick users into visiting malicious sites, likely to download further malware or engage in scams.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2807

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-redeem-codes-game-hack In PDF document text
    • http://solidcommunication.ch/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off00002daa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DAA 28024 bytes
SHA-256: fdd8f04c958a7e4a69d89418a36fbc23196f0471536747238dff91331fec2bf2
font_01_sfnt_off00006c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9C 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00007943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7943 18448 bytes
SHA-256: ac1fbd71dc65d7a5013a2beb110170fe519d7ae17df877d161357825f85fd2ae

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