Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bfe9406fb5dd00…

MALICIOUS

PDF

38.0 KB Created: 2021-05-21 06:11:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7f26f7f25171ac87fe086877e35beb79 SHA-1: f4a614d3f4bcd3e3fa4b906608034aa5aa0619d4 SHA-256: 21bfe9406fb5dd001084fa4ce33dc765eeaf596b9a028c3dff4a870904bc5285
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector for a 'free Robux' generator. The document body explicitly mentions 'Free Robux' and includes a call-to-action to access a generator, indicating a phishing or scam lure. While no scripts were extracted, the presence of malicious redirector links and the lure content strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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-just-enter-username-and-password-game-hack In PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-robux-master_GM431946152.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-rewards-app_GM406889139.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
font_00_sfnt_off000034be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34BE 26076 bytes
SHA-256: db669b64b31d4d4b1d933055af3b0b50b1a1a5c18ef99a1960ef6fabdd06ae43
font_01_sfnt_off00006ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF3 19448 bytes
SHA-256: 4f9e120e202de6bc84ec177104ad4fa84abe9ff586f44aa7e03787aebbe4e81a

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