Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4788674baef98ee…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 08:01:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2bfd6e72006c8ad938d1676edd8bbdef SHA-1: cff063d0c485510cfb4d248e851f46af6e7c5228 SHA-256: e4788674baef98ee8fcb47b50fe6e2013fe7df67cffd6811bbe7badf2a7f3362
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for free game items, directing users to a malicious redirector. The redirector, in turn, serves further malicious PDF files hosted on other domains. The ML classifier strongly indicates maliciousness, and the presence of multiple links to known malicious infrastructure confirms a phishing and redirection attack pattern.

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/431946152/free-roblox-avatar-game-hack In PDF document text
    • http://pustaka.bbppketindan.info/repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/blox-rewards_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-any-roblox-game-with-scripts_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/fbchampion_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-persons-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/300-roblox-accounts-free-v34m_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-free-download-mac-full-version-2021_GM479516143.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_off00002f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2A 22580 bytes
SHA-256: 4f0b210442e45f5f3355b132af0c728a478adc116a86d0f294703e360a59fe6a
font_01_sfnt_off00006151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6151 18868 bytes
SHA-256: 6e6ae3bd63f17b7a84d32be7ea579755ba0a16566dd6134a95c2623afc69ac02

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