Malicious PDF — malware analysis report

Static analysis result for SHA-256 2661de8608b38632…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 21:44:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: df7116f1ad9352fb21592b00bd0f7341 SHA-1: f6b35bb0dc60dadad57c4db4079c50b976a223d2 SHA-256: 2661de8608b38632f8a1e26b512126ecbf85a582a149655f9c93fbebf020a394
160 Risk Score

Malware Insights

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

The PDF document contains a lure related to game hacks and free generators, directing users to a known malicious redirector URL. This suggests the document is designed to lead users to malicious websites that may host further exploits or phishing content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious workflow.

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/406889139/free-spins-from-coin-master-game-hack In PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-printable-roblox-characters_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/roblox-free-models-virus_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-views-tiktok_GM835599320.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/robux-cheat-codes-2021_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-roblox-suit-shirt-templates_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/mcpe_GM479516143.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-spin-link-for-coin-master_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_off0000302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302D 22364 bytes
SHA-256: e47c2ff3e094fe41d153411cfd901c8906fab33d67eaf10a62cf020cc01d7d91
font_01_sfnt_off0000617f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617F 18432 bytes
SHA-256: 65a21218908e78d3b3e13bb6de659cda5883429e2feafaff43c4666217260e5f

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