Malicious PDF — malware analysis report

Static analysis result for SHA-256 443ec6634a2fc85d…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 23:50:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6cc30c97a39b5a959fb59115840cdeae SHA-1: fa21ff737ef3b954800fca66d9569b613d362697 SHA-256: 443ec6634a2fc85d3a46d4ad52fbd905cc690a300b81e726fd0e26e7cc6ed37b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a known malicious redirector. The document body explicitly mentions "Free Robux Generator No Verification" and links to a URL that appears to be part of a scam or phishing attempt. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to direct users to 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/431946152/free-robux-generator-no-verification-game-hack In PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/free-roblox-griups_GM431946152.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/best-free-lumber-tycoon-2-roblox-injectors_GM431946152.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://elearning.man1bekasi.sch.id/__statics/gudangsoal/files/free-daily-spins-from-coin-master_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
stream_002_off000031f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F2 23016 bytes
SHA-256: 627f56e9ca181a274ca6af757921e0cc0d5295a225cad7a536ca40a0469af839
font_01_sfnt_off000065e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E6 19072 bytes
SHA-256: e7f1824e88bb300dfe73d0982d2e974b610cf43959a10b1d34f5500451ac8bd8

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