Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11bb5904daa0b09…

MALICIOUS

PDF

33.4 KB Created: 2021-07-03 17:44:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2792d08432d3dccd4f713a939341d838 SHA-1: c416686d4a066d975d1689e6a3ad3d92258ccd59 SHA-256: e11bb5904daa0b090cc04bde7c619d6e64f6a7774aae22adf22d3ab021986fa3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a primary malicious redirector URL, designed to lure users with promises of game hacks and free currency. The heuristic firings confirm that the document links to known malicious infrastructure and employs a redirector. While no scripts were extracted, the embedded URLs and the nature of the lure strongly suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.tw/app/431946152/how-to-hack-roblox-accounts-for-robux-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-money-hack-apk_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/tiktok-free-generator_GM835599320.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/rbx-claim_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/robux-hack-tutorial_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-cool-shirts-free-shipping_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/phantom-forces-roblox-coin-hack_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/www-roblox-hack-net_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hacks-to-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_off00002b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B28 22336 bytes
SHA-256: 57e234fe9012544d051e55174f52786871f10f53e3e208c69ffda4cc53361407
font_01_sfnt_off00005d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D16 19228 bytes
SHA-256: c30d944de0a6baf9276c4865844fcb990da37fa04730b451441052e57c665125

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