Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6b6b07ee2292cd…

MALICIOUS

PDF

49.6 KB Created: 2021-06-09 01:41:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8d7b12efa5a43dae8ebd8db6aec92e6c SHA-1: efc3be5466b6afa467660f49825b71c0f4f13847 SHA-256: db6b6b07ee2292cd2896dda3dde5314b1a21bc70e947ed55da074b6e7fb0038e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators' to lure users. The ML classifier also flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to serve further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/how-to-get-free-robux-just-by-inspecting-it-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/robux-adder_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/stella-beta-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f9c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F9C 27892 bytes
SHA-256: d7d74c9ee6233e346ff52101e28ee2db7f894b42dbbb5dd65ff6f5006d8645ed
font_01_sfnt_off00008f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C7E 19212 bytes
SHA-256: f525046495137ca556c4d1a0eb5c3ffb59686d6eccab851ac332118bcd8a83eb

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