Malicious PDF — malware analysis report

Static analysis result for SHA-256 982900cfc50b2578…

MALICIOUS

PDF

34.5 KB Created: 2021-07-08 10:07:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 596d9f7076eb6cace1c593aeda65e24f SHA-1: 4b0434368a1138899675c7c1b522919156738405 SHA-256: 982900cfc50b2578ec894e521e78ef344646860270350be5e70de548b16f826a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising free game currency and hacks. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-without-offers-game-hack, which is flagged as malicious. The document body and embedded URLs reinforce the lure of obtaining free items for popular games, a common social engineering tactic. No scripts were extracted, but the presence of multiple malicious links indicates a phishing or scam attempt.

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/431946152/free-robux-without-offers-game-hack In PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/how-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-followers-on-tiktok-app_GM835599320.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/free-robux-no-human-verification-hack_GM431946152.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-robux-codes-november-2021_GM431946152.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/how-to-get-free-cash-in-boku-no-roblox_GM431946152.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/free-spins-coin-master-2021_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_off00002e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E66 22596 bytes
SHA-256: a025eea312d1c9ddbf6cfd7aa86adf6793a2f6960953ff0ef35fc0c812dae155
font_01_sfnt_off000060d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D6 19304 bytes
SHA-256: d28279064c80375efd82c55b38a8139998c8ec291e9a82c1a232f0005e70f64e

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