Malicious PDF — malware analysis report

Static analysis result for SHA-256 2151d843da532d32…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 15:29:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6a8fd2d4f1a23be156212c24a7c28771 SHA-1: 32e5afbeb9375841287b29e9fabdd50a336299b7 SHA-256: 2151d843da532d32a4483437802c44759fd0f979d47d62c918760efc180ecfbd
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting game hacks and generators. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into interacting with the document further. The ML classifier also flagged this PDF with high confidence.

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.
  • 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 http://netcdn.tw/app/479516143/minecraft-hack-mod-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-page_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-cheat-engine-hacks-december-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/run-free-roblox-id_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-coins-on-coin-master-iphone_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
font_00_sfnt_off00003147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3147 22404 bytes
SHA-256: a43a5345d6308afb458b1372836ec6589da04b58ff95d85534942f38948f53af
font_01_sfnt_off000062ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CE 18340 bytes
SHA-256: 49e8d41e4645ecbcf6c8cca7b2812b927382294641a04bb93a79b652b6b1cc7e

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