Malicious PDF — malware analysis report

Static analysis result for SHA-256 8886fa02e2c3ceea…

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 07:23:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e5cc1df3706cc7f9b35d44ee3671afa8 SHA-1: 45f3ad45641c455eb7edeb224cf5675be2d73d75 SHA-256: 8886fa02e2c3ceea982035e7be01ff40e384a02812749276d64be5ba6f7cdb1e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free robux'. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-hack-apk-35-13-game-hack. This indicates a social engineering lure to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of embedded URLs and the nature of the lure strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/coin-master-hack-apk-35-13-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-gift-cards-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacker-de-roblox-00_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_off00003377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3377 23452 bytes
SHA-256: 6e80508d25bd06670b19c804392030d1976858e47c7b5c8239f4d1f158ecdf85
font_01_sfnt_off00006852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6852 18592 bytes
SHA-256: 7f49051940b6b9efc6132f30ff89e7b8d09fd75ee36cd2478622d195921c531a

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