Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db3be351cf4015d…

MALICIOUS

PDF

43.1 KB Created: 2021-05-13 12:40:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1e300627beae98733bac6743f4270107 SHA-1: 6a5a307e9aedb940e6439b59110c1fa0c3b26148 SHA-256: 4db3be351cf4015d7271b43bcedd452ce04a54301fb16d81b5d47cf04f3c0681
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document employs a fake CAPTCHA lure to trick users into clicking on numerous links, many of which point to other PDFs. The primary redirector URL, https://netcdn.xyz/app/431946152/how-to-hack-robux-game-hack, is associated with game hack lures, suggesting a scam or phishing attempt. The extensive link farm indicates an effort to drive traffic to potentially malicious or ad-heavy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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.
  • 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-to-hack-robux-game-hack In PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/robux-earner_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-free-100-spin-link_GM406889139.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_002_off0000451f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x451F 28132 bytes
SHA-256: ad63a1e1035f5490446a273fd4ae13e454fd589e4e7dd8d33b822bc5ca3d4d4a
font_01_sfnt_off0000861a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x861A 18412 bytes
SHA-256: 799ae8847f356c5b4d712fc876b96dd84d848442331064266ecb6e470ae97e62

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