Malicious PDF — malware analysis report

Static analysis result for SHA-256 8601f8d3a3438f44…

MALICIOUS

PDF

34.2 KB Created: 2021-06-30 06:39:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3aa83598bfa4d720c95d218c1fc42905 SHA-1: ac42fa3d7a097fb036a668dd7e5c3c19e9189668 SHA-256: 8601f8d3a3438f44f3093dcf7a848e39f43afdcd1f2b4d86b99d9d47bab9423e
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one to a known malicious redirector, that promise free game currency or hacks. The primary lure is for 'free robux' or 'game hacks', directing users to the URL http://netcdn.co/app/431946152/how-to-buy-headless-head-in-roblox-for-free-2021-game-hack. This indicates a phishing or scam attempt designed to lead users to potentially harmful websites.

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/how-to-buy-headless-head-in-roblox-for-free-2021-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/robux-get-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-keeps-freeing-whne-loading_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/instantrobux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-groups-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-in-2-seconds_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-phantom-forces-all-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/robux-link_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F31 21536 bytes
SHA-256: 183c500ce8de09b5ecdbab8a206f55d9ab1180c0e7dfed0537e62e164f8feacf
font_01_sfnt_off00005e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E34 19708 bytes
SHA-256: b42fd21f637bbad28154f4293c8f4a19b3fdee59817c2f9b19bb2df5111ceda5

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