Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3da86a95517639…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 02:23:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5c150efc87b175ccd838f8f87a991d4b SHA-1: d3e16e5f1f121208f5d0bf0eadb620391bf5cf0f SHA-256: ee3da86a955176391fd22e0df390fd373d3d85efa6be2f0d6d3ec9aff37aba2b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded URLs that lead to a known malicious redirector, masquerading as a 'free generator' or 'game hack'. The document body and heuristics confirm the lure is for game-related cheats, specifically mentioning 'Coin Master' and 'Roblox'. The primary IOC is the malicious redirector URL, which is likely used to deliver a second-stage payload or phish for credentials.

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-free-spins-2021-no-human-verification-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-make-your-roblox-shirt-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-gte-free-robux-2021-still-work_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hacks-para-roblox-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-builders-club-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/cheat-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hack-robux-using-chrome-web-store_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-2021pc_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-free-robux-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-edit-money-value-cheat-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/invisibility-hack-roblox-jaulbreak_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-admin-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-surf-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-usernames_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-on-mac-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/what-happens-if-you-go-on-a-free-robux-website_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-tix-and-robux-generator-free-download_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_off00003211.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3211 22596 bytes
SHA-256: a6a632166f8af34af45b131089803d320df07ed1703ec30121c07ad1d3a18d19
font_01_sfnt_off00006454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6454 19112 bytes
SHA-256: fb4821b270f07fea72f4a01c6c2f5a9088defca8ace128bd60f9e0b10e4ff732

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