Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c337b8f98cbe429…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 23:37:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 354be71634741fabcdc1f3d42385e1d5 SHA-1: 22ed61443dccec57f565d3e2735d35a64c0fdd55 SHA-256: 1c337b8f98cbe4291ced23120e34b0a92b174f05f5855322b1a0c3b4f3daee9c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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-apk-hack-2021-ios-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/gabes-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/howto-get-free-robux-hack-javascript_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/haktuts-free-spins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/simon-says-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/pubg-uc-zarah_GM1330123889.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/play-roblox-com-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-elemental-dragon-tycoon-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-permanently-have-free-robux-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/best-way-to-hack-roblox_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
stream_002_off00003336.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3336 23028 bytes
SHA-256: 0de1ad3c9db0eae6c522a8c3aa4e74ba75f3c3c12729234f238df1c6375e659b
font_01_sfnt_off000066da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DA 18580 bytes
SHA-256: 16d176bdf1b867fef3a97f0f45415bfc91080120e19e93be694a9c372efb77eb

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