Malicious PDF — malware analysis report

Static analysis result for SHA-256 271fa64cb1d3c94a…

MALICIOUS

PDF

48.5 KB Created: 2021-06-03 08:16:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 08b1269779f122684c628addb53d1928 SHA-1: 437dd7f44900e840aee0cb921ba1ee856712ce97 SHA-256: 271fa64cb1d3c94a43e81c023b9ae5e3d3f13c4683e9398689655016cc7bd12c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, including a primary link to a known malicious redirector disguised as a 'free generator/game hack'. This suggests the document's purpose is to redirect users to potentially malicious sites for further exploitation or phishing. The presence of multiple links and the ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://netcdn.online/app/431946152/free-robux-2021-game-game-hack In PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/tiktok-free-view-easy-verification_GM835599320.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/tik-tok-free-fire-kreatif-lucu_GM835599320.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-skin-free_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/wurst-18_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/daily-free-spins_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53BB 24784 bytes
SHA-256: caff87b32f9b31011f83c9e6069756d7b59f87ab2f685e92afe6a337dab864e8
font_01_sfnt_off00008c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C66 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000990d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x990D 18904 bytes
SHA-256: 283a1a33a2741d831b3d4ae5e516616da737cba9bfd6b37f6661d5e898e16dcb

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