Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac56a7cac9a36ebd…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 15:40:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c060de9560456af75b9878b5bc4d212d SHA-1: 473f46adda654f5985bd88503a84b3f509adf504 SHA-256: ac56a7cac9a36ebd2823981e52e85df5371e886d98c2615031a426cb01623fdd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to malicious redirectors, masquerading as "free generators" or "game hacks" for popular games like Roblox. The primary lure is the URL http://netcdn.tw/app/431946152/free-roblox-outfits-2021-game-hack, which is flagged as a known malicious redirector. The document's structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

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-outfits-2021-game-hack In PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/hack-roblox-prison-life-v2-02_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/codes-for-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/888-robux-free_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-bypass-key-systems-on-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-robux-nordvpn_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/download-roblox-free-windows-10_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-premium-hacks_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-get-free-robux-without-using-personal-information_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/pokemon-go-free-bundle_GM1094591345.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-robux-android-app_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/hack-buy-robux_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/como-hackear-juegos-de-roblox-2021-sin-descargar_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-robux-cydia_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-free-account_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_off00003125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3125 22420 bytes
SHA-256: f1fc835a2412d07c5da32f95f1c66680683431fff881b955eac2089f4d6dc9bf
font_01_sfnt_off00006329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6329 19416 bytes
SHA-256: a242c086af701212af7b881199acd0b204cb1f7b110dba78a4069fe4bdcc1034

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