Malicious PDF — malware analysis report

Static analysis result for SHA-256 543ca3923069b98b…

MALICIOUS

PDF

33.9 KB Created: 2021-07-09 10:58:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 72010ea1ade74844aa108e11dc38d1eb SHA-1: 62e4bf14d39aaa415e2d95b84656effaec7bcc78 SHA-256: 543ca3923069b98bd4e477b1a3cb2c76a28eb2e5529b39aa38b4ff9b70478e1b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs that redirect to malicious infrastructure, specifically advertising free followers and game hacks. The document body and heuristics indicate a lure designed to entice users to click on these links. The primary malicious URL identified is http://netcdn.tw/app/835599320/who-tiktok-free-followers-game-hack, which is flagged as a known malicious redirector.

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/835599320/who-tiktok-free-followers-game-hack In PDF document text
    • https://www.ma-plast.hr/files/free-groups-with-funds-roblox_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/hack-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/robux-for-free-no-scam_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/welcome-to-my-free-modeled-game-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/instantrobux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-robux-python_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/hacks-for-jailbreak-beta-roblox_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/roblox-rc7-free-download_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/minecraft-bedrock-server-hosting-free_GM479516143.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_off00002fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDE 22128 bytes
SHA-256: 38b527069aef59cbdf5a51b4be7d5b5b9eef7b283a5fefeb171e2211544e9060
font_01_sfnt_off00006106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6106 18572 bytes
SHA-256: 61d227a559129ff8b560976aab957617c30a8b22222ce8cd97045cbc7785551f

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