Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee38f684dc44dd2…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 13:28:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3549ceef0212f7809f7948e2d7ce908b SHA-1: 97227adf3aa6451f64c5ce8ecae4aad9fc8125d0 SHA-256: 1ee38f684dc44dd2149d2cad5a4c8f76b094e3b577e3ae38e03e7a90c9130c6b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The primary URL, http://netcdn.tw/app/431946152/roblox-free-robux-no-human-verification-game-hack, is identified as a lure for potentially unwanted or malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt designed to redirect users to malicious 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/431946152/roblox-free-robux-no-human-verification-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/a-game-on-roblox-that-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-skull-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/get-me-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-profe_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-hack-no-survey-or-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-denisdaily-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-free-items-november-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/all-vip-admin-commands-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/hack-robux-infinitos-en-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-hack-generator-download-no-survey_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_off00003153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3153 22488 bytes
SHA-256: 6e2f098232048d4e392a8f099726ef1cd514e2b6eec1f2571e898c44184a06fa
font_01_sfnt_off0000633c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633C 19408 bytes
SHA-256: d2ef309b92771ae7bb099a6b634574daefb8445dd777fce633f2a8c245e3903e

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