Malicious PDF — malware analysis report

Static analysis result for SHA-256 7136566b05032940…

MALICIOUS

PDF

49.2 KB Created: 2021-06-11 13:33:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 885bb2562c225213291f8ffa7176809c SHA-1: 572cbf049a93d4aa860e0101606c18dee4c345f0 SHA-256: 7136566b0503294080db4fe2dd3e3c852650e633ed6faaf2b47694645909a6f8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'game hacks' and 'generators' to lure users. The primary redirector URL is https://netcdn.tw/app/431946152/roblox-typical-colors-2-hack-script-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious redirection workflow, likely intended to deliver a second-stage payload or phish for credentials. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-typical-colors-2-hack-script-game-hack In PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/free-roebucks_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpulau.com/opac/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://pspmrsmbpulau.com/opac/repository/free-costume-roblox-glitch_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpulau.com/opac/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://pspmrsmbpulau.com/opac/repository/how-to-get-promo-codes-robux-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpulau.com/opac/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpulau.com/opac/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpulau.com/opac/repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpulau.com/opac/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B1 25828 bytes
SHA-256: 15f7a1c2172542b22e51e60eda58bd6a904cddca07fae7d54a53e7d20f43ec79
font_01_sfnt_off00008e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E99 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAB 18884 bytes
SHA-256: 8ae04ea74f22b4d6ce499aa449215d71803eccacf5d46978f59bddc429bddf96

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