Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca4258f616946a9…

MALICIOUS

PDF

48.3 KB Created: 2021-06-03 14:09:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c8f256fba57d770dce6afb9890e89299 SHA-1: e982be22543233a313d1d49e5cfba0979fdf1d34 SHA-256: 8ca4258f616946a982d3075ba8d95834e6499d57905121301c77d9234d894cda
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple heuristics indicating a malicious redirector lure, impersonating Microsoft to trick users into clicking a link for a 'Roblox Robux Generator'. The document body and embedded URLs reinforce this phishing and scamming attempt. While no scripts were directly extracted, the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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: https://netcdn.online/app/431946152/roblox-robux-generator-no-human-verification-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
  • 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.online/app/431946152/roblox-robux-generator-no-human-verification-game-hack In PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/pubg-uc-180_GM1330123889.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/can-i-get-minecraft-windows-10-for-free_GM479516143.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_004_off000050b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B4 32456 bytes
SHA-256: 1e21c420befa1f56c78301ef2eb09b6a7b4014b78d02f3651bd088804df9155b
font_01_sfnt_off000098e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98E8 18772 bytes
SHA-256: d70e1896760ce565ff795a6c5d74f9ef69d680ae9e1e6e3d1ff99995b7d1b431

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