Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c89b0be07ab789…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 09:38:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2f0a157d457c78a99af0189e6ae3ab45 SHA-1: fa19979f0d76d767dac10e992feb881836f62d2c SHA-256: c2c89b0be07ab7894ca7b7bdb55196d9f51929d69dd35e322580f5b33dbe52d0
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generator / game hack' lures. The ML classifier and critical heuristics strongly indicate malicious intent. The document's content and embedded links suggest a phishing or scam attempt designed to trick users into visiting potentially harmful sites.

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 http://netcdn.tw/app/406889139/free-spins-and-coins-blogspot-coin-master-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-admin-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-2021-game_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/check-cashed-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-obby-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
font_00_sfnt_off000030a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A9 22604 bytes
SHA-256: 13bce85f73f159f28f0f21090b23e16f491dfceeebc1bbdd271514663bd2c40a
font_01_sfnt_off00006330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6330 18636 bytes
SHA-256: 81c706591927eb79e6943da1b13ffaba4e197950c80117a06d94c90a496f3d49

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