Malicious PDF — malware analysis report

Static analysis result for SHA-256 da09c988b1bd87ef…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 04:54:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b480bde96eb61f05fdf2c38cf55af420 SHA-1: 6a4c3fec69c9b2ac2f3f7b227b1130c912b56a34 SHA-256: da09c988b1bd87efe226da99d33f471f962dc7c1057bf3f571babc66e615b7a5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external sites, many of which are part of a link farm designed to lure users with promises of game hacks and free items. The primary redirector URL, http://netcdn.tw/app/406889139/coin-master-mod-version-free-download-34-4-game-hack, is flagged as malicious. The document's structure and content strongly suggest a phishing or scam attempt, likely intended to lead users to malicious content or potentially download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-mod-version-free-download-34-4-game-hack In PDF document text
    • http://bw.ac.th/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/hack-for-one-piece-open-seas-roblox_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/grabpoints-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/pokemon-go-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/running-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-free-costumes_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-can-you-get-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_off00003125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3125 22392 bytes
SHA-256: c33428927ca47f02db30c15eb9d6182e938266edffd5d535509169ca6c222149
font_01_sfnt_off0000630a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630A 18948 bytes
SHA-256: 20da5c72a1d03ec8b18d4a26f1a86c223fb80eec5faf3ffb84824929e40f9207

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