Malicious PDF — malware analysis report

Static analysis result for SHA-256 5545adb318b40c90…

MALICIOUS

PDF

48.5 KB Created: 2021-06-04 04:29:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dfa3ba643a14587e50a37adfa2a2ec6a SHA-1: 026041a9edcf35f28cc3e98c699a37404fe80257 SHA-256: 5545adb318b40c905333465993786bd6510fe678c28d1bfbf05ae416208e212d
122 Risk Score

Malware Insights

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

The PDF document contains links to external websites that promise game hacks and free in-game currency, a common lure for phishing and malware distribution. It also displays a fake CAPTCHA to trick users into interacting with the document, likely leading to the download of a second-stage payload. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • 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
  • 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 https://netcdn.online/app/406889139/free-spins-coinmaster-game-hack PDF link annotation
    • http://perpus.stfm.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/robux-games_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-coin-app_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005287.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5287 27616 bytes
SHA-256: 0246e7cea52af84987dcf65db7c14f6d068d3eb2d09d151d47972f0669c02be9
font_01_sfnt_off000091de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DE 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B91 18148 bytes
SHA-256: 022383ce4ee195efe1c5dea367cdebf7cbe1f3fcf8800e4ec6c2e24f5959d50c

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