Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a227f71856cc58…

MALICIOUS

PDF

48.1 KB Created: 2021-05-12 15:36:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 69edba0917feb6462a5a17df60593ee8 SHA-1: 42153b84ab026e14f7ec27feca495b0e252928bc SHA-256: 66a227f71856cc5861d511b4960aeb88423674ccc2e62ecefc3ae99550ca0d36
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking a link, which is a common tactic for delivering malicious payloads. The primary link points to a redirector infrastructure known for malicious activity. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to initiate a download or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.xyz/app/431946152/how-do-you-get-robux-game-hack In PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-robux-working_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/rbx-claim_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/20-free-spin-link-coin-master_GM406889139.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
font_00_sfnt_off00004d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D65 27924 bytes
SHA-256: 8c475b70848746fdd3a2d9fc80d5fe62f11bfe4fe09136f7af691170748ef83c
font_01_sfnt_off00008bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD0 4044 bytes
SHA-256: 5196410bcdfc72ecb4ad7d922073bb6d34bf55d37084e4ffe688bf66f2d13d53
font_02_sfnt_off000098fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98FA 18448 bytes
SHA-256: d9f15c8d06a9f68edc08429574edcd345d0edfc323a0421ca163819fb1e2672f

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