Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e679a906dd503a…

MALICIOUS

PDF

35.2 KB Created: 2021-06-29 16:01:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1321c9c084f97b93fc21233d00b5c22e SHA-1: 95a71dffd751ef63b1767f7a1e024b9712ae9b2e SHA-256: 21e679a906dd503a872da2c7edaa63166c8f203fcad37f89ed1ac567d1e18b7a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, that promise game hacks and free currency. The primary lure is for 'Robux' on Roblox, directing users to http://netcdn.co/app/431946152/robux-hacks-that-actually-work-for-everyone-on-roblox-game-hack. This indicates a phishing or scam attempt designed to lead users to potentially harmful websites. No scripts were extracted from this sample.

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.co/app/431946152/robux-hacks-that-actually-work-for-everyone-on-roblox-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/como-instalar-hacks-para-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/get-free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/checking-free-models-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/robux-website_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-free-pokeballs-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-after-the-flash-hack-item-unlocker_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/pubg-uc-kr_GM1330123889.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-800-robux-for-free-nov-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/roblox-hacks-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-roblox-accounts-2021-december_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/is-minecraft-free-on-mac_GM479516143.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_off0000307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307A 22512 bytes
SHA-256: 065c8b996a8050d2f31fdaaceed697cc8417934185c2c31b7725f4226fc2ca15
font_01_sfnt_off00006291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6291 19720 bytes
SHA-256: 19a6f58eecabfb18b1677dcd3c0ed896dfca2393dc0a683a362ca89df00f34ae