Malicious PDF — malware analysis report

Static analysis result for SHA-256 9055bb42cc1c52eb…

MALICIOUS

PDF

45.6 KB Created: 2021-05-17 11:00:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f2b7807f53d750427e396e4e4a99c572 SHA-1: 071bd6c1632bf0dd64f6abed2d50c66508b7bb15 SHA-256: 9055bb42cc1c52eba738341e368519679efd4d6b198077f119e84adaed988188
160 Risk Score

Malware Insights

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

The PDF document contains multiple links designed to lure users with promises of free game currency, such as Robux. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-hack-2021-game-hack In PDF document text
    • http://spentulib.com/search/repository/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search//repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search/repository/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://spentulib.com/search/repository/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-no-verify-2021_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_003_off00004ae3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE3 29160 bytes
SHA-256: be02125035fc810c3f948a5afc7164de292fd216b11a655980a917bb909e94e9
font_01_sfnt_off00008dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAB 19084 bytes
SHA-256: bf126c80224e4ece1a877f3c45a4e2f725662c205f8b78a709aa4c80730d283c

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