Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddb45d857f2fb66…

MALICIOUS

PDF

43.7 KB Created: 2021-05-13 00:02:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 97591c2648b7e776f8ef83902c78ea16 SHA-1: 0d4ae68283d3dd1528dd197c82f7132e0db6d4d8 SHA-256: fddb45d857f2fb66f3defcbe6b8c18d3085c6a2d49f779b7ff522e2a1baf1e23
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free in-game currency, such as 'coin-master-hack-activegamer-game-hack'. This is a common lure for phishing or malware distribution. The presence of multiple links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/406889139/coin-master-hack-activegamer-game-hack In PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/moon-active_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/minecraft-maps-pe-free-download_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
stream_003_off00004baf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BAF 26400 bytes
SHA-256: df65ca12f235dfc0bc91666eebdda3596cf14865e48debc28fc1ca883c51cb31
font_01_sfnt_off00008808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8808 18376 bytes
SHA-256: 7942159ea88d166bbca90a684af9c7642873a6db171e4c543e33bc315b6ed94a

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