Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3854778d266e55d…

MALICIOUS

PDF

33.7 KB Created: 2021-07-03 15:37:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 58c866fe39dc6cb0a0484211f7ed8dfb SHA-1: 9c09b32ed7202834afd3a083d7e8920f96a0e290 SHA-256: e3854778d266e55dd6674424bdbde69cdd73caaa6f6497f083ff4cf7dbfdac88
220 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs designed to lure users with promises of free game currency or hacks. The primary link directs to a known malicious redirector infrastructure, indicating a probable phishing or malware distribution scheme. The document's structure and content strongly suggest it's part of a campaign to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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 http://netcdn.tw/app/479516143/can-i-get-minecraft-for-free-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-community-discord-does-it-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/inject-hack-roblox-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-codes-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-in-console_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/comment-avir-des-robux-sans-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-soldier-gfx-ww2-german_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-gift-card-pins-2021-august_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/download-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-no-human-verification-no-survey_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
font_00_sfnt_off0000310e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310E 22060 bytes
SHA-256: 0800671cfabda1177113dccf26f4398bf0aefd383f778d820078b83c9c41dbbb
font_01_sfnt_off000061d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D8 17996 bytes
SHA-256: e6fcd10c978a651d981c94814daa7d4c9dc519d22899a404f27347f868a504f2

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