Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8d6bb40feec795…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 11:06:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f23671c5176eff210fc7b9db11a6564b SHA-1: 2beb173af0148eeb05c345bc02720b10ba850c80 SHA-256: 2e8d6bb40feec795bc392d17e535ddf7ffbe94ce9f1687e3c850815b622f30e2
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/406889139/coin-master-free-cards-hack-game-hack.
  • 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-cards-hack-game-hack PDF link annotation
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/descargar-programa-para-hackear-roblox_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/roblox-maps-free-download-online_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/is-bloxburg-roblox-free_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/roblox-free-draw_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-hack-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/robux-hack-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/hack-coins-pizzeria-roleplay-remastered-roblox_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/army-roblox-free-play_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/promo-codes-make-robux-free-robux_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/zephplayz-free-robux-easy_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
font_00_sfnt_off00003255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3255 22836 bytes
SHA-256: 7f5502a21bf9363eebe801b59d93b9ceaba273e347bc3318e98ba04c9f6d4ad4
font_01_sfnt_off00006582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6582 18340 bytes
SHA-256: 46bbcb93cdf3c0d295b315ab7e658e4bf46b20485efcdd5d2b69d88a805ee664

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