Malicious PDF — malware analysis report

Static analysis result for SHA-256 7742cad36ee11021…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 13:49:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 36a43b65aff2b8d8f7f35e6a57d8d8d6 SHA-1: 9e58a73d0efd043c589045708816f904a09b5917 SHA-256: 7742cad36ee1102136459af826b0a7952bed881bcfd75e56fd12b7ffd30797d8
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into clicking a link. This link, presented as a 'game hack generator', redirects to known malicious infrastructure. The document's content and heuristic firings strongly suggest a phishing or redirection attack designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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
  • 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/406889139/coin-master-400-spin-link-today-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/jailbreak-script_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pubg-uc-olx_GM1330123889.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/master-coin-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-link_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005229.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5229 24792 bytes
SHA-256: 49a1b26be180dd1220fcfb0bcb9b2f1fd9c392754602a190f07206226c646e31
font_01_sfnt_off00008b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B58 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off0000950a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x950A 18480 bytes
SHA-256: dad02a5aef0ea5dcf7b1fe658ab5d5874ad8a27366cac98dbe4b862ee070bc87

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