Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66d3a8e0e3bdc0c…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 08:59:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 116007e136d50c85a45fc51e603200f2 SHA-1: 15e97e9792d7001070dbec1d1a720a34e217f4e8 SHA-256: b66d3a8e0e3bdc0c3521e127994b93e61e54dba962c09a9a0a01ef4e075cedb2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/coin-master-free-spins-and-coins-haktuts-game-hack PDF link annotation
    • http://elib.upiyptk.ac.id/opac/repository/username-free-robux-site_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/maiu-maiu-roblox-hack-rc7-scrpt_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/robux-free-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/lemonade-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-and-tix-youtube_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-red-hoodie-free-now_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-redeem-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/app-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_off00003014.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3014 23356 bytes
SHA-256: 169802a6fa24a8ca4483db118dcffe1a1dcbabf219432e8b6ee8d5024cbe37ec
font_01_sfnt_off000064b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B2 18656 bytes
SHA-256: 2d759c9c8811e6c0575dd1569354feb394dafb387e5a2f9a3fadbada3c585f82

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