Malicious PDF — malware analysis report

Static analysis result for SHA-256 689e6be9171bb8fd…

MALICIOUS

PDF

43.3 KB Created: 2021-05-17 07:32:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8e619c7c6e12b12baaaa47c09f0130b0 SHA-1: 5e82d7777e3db0f40d29f61575267d76e23bcbce SHA-256: 689e6be9171bb8fdf7ab348155fe119c56d82463a97d0fa4a1edd144ac5bdcf1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and sites offering game hacks and free currency, indicating a lure for users to download potentially malicious files or visit phishing pages. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/406889139/coin-master-blogspot-game-hack In PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/robux-game-com_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/give-me-robux-now_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
stream_003_off00004da9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DA9 25344 bytes
SHA-256: 778194becd350dfaa6fc22441b22a91e8b84888808f5085fbf6b41b4d51ef117
font_01_sfnt_off000086e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E2 18300 bytes
SHA-256: 856755575c1a7459373c524fcaf021c967fba3d5c4d4b4c6d782a1862ea9e167

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