Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f51b20932b7873…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 05:44:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7dfb1d783b7e48b37d4db0b3e7e0912a SHA-1: 5325b23363e33e18daca74d194c19265dc8208b3 SHA-256: 86f51b20932b78730f4b36b81df68048a3bffc91f0a948a561f834c1d32b4dcc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, masquerading as game hacks and generators. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-mod-version-free-download-game-hack. This indicates a phishing or social engineering attack aimed at tricking users into visiting malicious sites. No scripts were extracted, but the heuristic firings strongly suggest a malicious redirector chain.

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-mod-version-free-download-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/lvl-7-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-cheat-engine-64-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-no-spam_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/google-moon-active_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-by-watching-videos-and-no-surveys-or-downloads_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/new-roblox-retail-tycoon-hack-exploit_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
stream_002_off0000312e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x312E 22524 bytes
SHA-256: 1fdd248e3168323ec2e525890763eef9c5b882cdb37ff9352c3fc0baec9a577c
font_01_sfnt_off0000635a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635A 18712 bytes
SHA-256: 71a09ee6f880fbc89129f73592ba447c972cee7fa24c7fdfce562b85b17c7c45

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