Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c7fb85ad3b5828…

MALICIOUS

PDF

33.1 KB Created: 2021-07-03 14:55:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2ab9c673d97cb94c84085ef5016808b0 SHA-1: 34580d610bed49a515399b188eb518651140e093 SHA-256: c1c7fb85ad3b58281e37fac5b386d1e7ca420fcd739db89acbf69b3b5b682a29
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free currency' for games like Roblox. These links, such as http://netcdn.tw/app/431946152/1x1x1x1-hacker-roblox-game-hack, are designed to lure users into clicking and potentially downloading further malware or being directed to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/1x1x1x1-hacker-roblox-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/best-roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-on-roblox-by-playing-games_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/cool-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/mad-city-roblox-hack-pain_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-players-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hack-para-roblox-2021-julio_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-vip-server-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/candy-van-roblox-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hack-unlimited-free-robux-tickets-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-hair-in-roblox-girl_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-clip-art-from-google-roblox-birthday-8yo-boy_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-hack-install_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-pro-roblox-island-royale-acc-and-passwords_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-create-your-own-scripts-hacks-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-codes-2021-without-human-verification_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_off00002bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BC3 22240 bytes
SHA-256: 7cefc5000a98bbf79e2da95134a08a7b16218b0e788117e3495bdd9f00ec745b
font_01_sfnt_off00005d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D22 18760 bytes
SHA-256: 4d91ccb4939306687d10f5b3554229d003bec6f18936394c7553cae0fe0b7fa3

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