Malicious PDF — malware analysis report

Static analysis result for SHA-256 71956f60be90911a…

MALICIOUS

PDF

45.4 KB Created: 2021-05-17 02:01:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e04b378ce5b1ed5ae7247c76b1b92136 SHA-1: 2036f934415215dcb5e5b747db1ee70f803982df SHA-256: 71956f60be90911abdcd0598ea1a8d487748359354712b0db3ccbb59398db415
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9507

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.xyz/app/406889139/free-coin-master-hacks-no-verification-game-hack PDF link annotation
    • https://cluster-consulting.com/images/coin-master-free_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/robux-for-kids_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/roblox-comroblox_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/picture-roblox_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/robux-survey_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/roblox-generator-com_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.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_003_off00004a6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6D 26040 bytes
SHA-256: eab44093a75998ee60988002d0420cdbdbf4c42b720132397440da7ed5880f93
font_01_sfnt_off000084b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B9 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off00008fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBC 18016 bytes
SHA-256: 22df04c4dacbc852f4ecaf83adb1826ed6293343c5161e377e09b669fc2092ee

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