Malicious PDF — malware analysis report

Static analysis result for SHA-256 22941598c8d2c383…

MALICIOUS

PDF

33.7 KB Created: 2021-06-29 03:32:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4569fb217162ee7d1a7b93857e1f7329 SHA-1: e5f8b7a4720dc0f3203d52610230cbcfd766b2fe SHA-256: 22941598c8d2c3835cf0c6d4ecf73f290a9796dd153b8bad991ccde1154b975a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, including a primary redirector at http://netcdn.co/app/431946152/free-robux-easy-obby-game-hack. These links are presented as lures for free game items, a common social engineering tactic. The ML classifier and specific PDF heuristics confirm the malicious nature of these links, indicating they lead to known malicious infrastructure. No scripts were extracted, but the document's structure and embedded URLs strongly suggest it's designed to redirect users to potentially harmful sites.

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/free-robux-easy-obby-game-hack In PDF document text
    • http://yochin.org.tw/images/free-app-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/discord-free-robux-bot_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/john-doe-hacker-roblox-march-18_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-doing-tasks_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-roblox-gear-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-base-wars-the-land-cheats_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-free-cloathes-in-roblox_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/tiktok-free-followers_GM835599320.pdfIn PDF document text
    • http://yochin.org.tw/images/stealer-hack-roblox_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-delitive-mod-cheat-codes_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-roblox-bc-accounts-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-roblox-privet-strucid-servers_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
font_00_sfnt_off00002d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D31 22292 bytes
SHA-256: 18fcd90c9542d415aea4450d10293bf5f78cd2511ca413684c49d4c156fc4205
font_01_sfnt_off00005edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDB 18896 bytes
SHA-256: 7fb4263d18d0da2a71214cdc7c197f085383630dddb284123a46668954db42ec

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