Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be2021aa01b9260…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 16:48:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 88102ed81e548ee491e7446f83268c02 SHA-1: 92e56b34a6b37eb3765358e3edcf73ddca461aef SHA-256: 7be2021aa01b92602c40873bbb38b1c5726606b80809e31ef469b9a4088bf0cf
182 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 a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9971

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/coin-master-free-spins-ios-app-game-hack PDF link annotation
    • http://elearningman2jember.com/__statics/gudangsoal/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://elearningman2jember.com/__statics/gudangsoal/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://elearningman2jember.com/__statics/gudangsoal/files/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://elearningman2jember.com/__statics/gudangsoal/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://elearningman2jember.com/__statics/gudangsoal/files/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://elearningman2jember.com/__statics/gudangsoal/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://elearningman2jember.com/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elearningman2jember.com/__statics/gudangsoal/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearningman2jember.com/__statics/gudangsoal/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://elearningman2jember.com/__statics/gudangsoal/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://elearningman2jember.com/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://elearningman2jember.com/__statics/gudangsoal/files/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • http://elearningman2jember.com/__statics/gudangsoal/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearningman2jember.com/__statics/gudangsoal/files/play-coin-master_GM406889139.pdfIn PDF document text
    • https://elearningman2jember.com/__statics/gudangsoal/files/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://elearningman2jember.com/__statics/gudangsoal/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearningman2jember.com/__statics/gudangsoal/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://elearningman2jember.com/__statics/gudangsoal/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://elearningman2jember.com/__statics/gudangsoal/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://elearningman2jember.com/__statics/gudangsoal/files/how-to-get-free-robux-without-any-verification_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
stream_003_off00004b73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B73 24656 bytes
SHA-256: 14b7cb59ecea8500ce66fccbdafa2878b65e990edcb6ad1658a9079b87d4f132
font_01_sfnt_off000083e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E3 17884 bytes
SHA-256: dc4be9eca4043c451860dc040d84e7fc0527576754fa5be74ed410eba2640189

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