Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdb60572ebbc83e…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 05:51:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d2d773ec1b4e6f415468ce93994259f1 SHA-1: a4589015fe07050a1a7f7cc77c0567b7987a30b2 SHA-256: 8cdb60572ebbc83e5a46e3339f42e1131ea8f8729a8542e98e7cbcc26ddaab96
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 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.online/app/406889139/get-free-spins-coin-master-game-hack. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 https://netcdn.online/app/406889139/get-free-spins-coin-master-game-hack In PDF document text
    • http://library-fkip.uho.ac.id/repository/download-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-hacking-system-download_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-attacks-on-coin-master_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_004_off00005187.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5187 24412 bytes
SHA-256: 3e8a95196672d9ee81d0c2f0e5dae3fb66d11755a7746014d90dbdd1e773a375
font_01_sfnt_off000088ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88EE 17884 bytes
SHA-256: b0210710b9f532dde69bab3e54691bd54d84b0d7d990975f20826afd1ba27450

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