Malicious PDF — malware analysis report

Static analysis result for SHA-256 d823bdd201e46035…

MALICIOUS

PDF

34.6 KB Created: 2021-06-27 11:51:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e4c5bd21537abe62da3587630af112b0 SHA-1: 4aa5019ec0be27e9b82eed5d110af6408e66c7a0 SHA-256: d823bdd201e4603571c2e06890ade1d7278f1242672d4959b5a2150fa68d7011
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites offering 'free generators' and 'game hacks' for popular games like Roblox and Coin Master. These links lead to malicious redirectors and further PDFs, indicating a phishing or scam campaign. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm the presence of redirector links and a lure for downloads.

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-gard-game-hack In PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-map_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/what-is-the-fastest-way-to-get-xp-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/pokemon-go-free-647_GM1094591345.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-bucks-hack_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/arsenal-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-robux-cheat-2021_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-robux-codes-rewview_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/earn-free-robux_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_off0000311c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x311C 22200 bytes
SHA-256: 6d88928a8b582a6f690dc301f1e67a6428af93678f53e11da57a6a7586f71489
font_01_sfnt_off00006270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6270 18888 bytes
SHA-256: c0039d9a62b3e8839c6f13e9bbe0f15fe4a63f35f45ce1f58a830d77a67d84f9

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