Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d6ba07cbd10044…

MALICIOUS

PDF

42.4 KB Created: 2021-05-18 01:52:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6bea46309ab3c5c0b22b3b0923cf5071 SHA-1: b660ee33ba5354f31d0d2f5d760bcb1f9f9c7f3f SHA-256: d4d6ba07cbd10044382f118801cdcd58602b2e0e5200afccf310b8dd62b25b97
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are presented as download buttons or lures for game cheats. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms a mass of external links, suggesting a link farm or phishing attempt. The primary IOCs are the numerous URLs pointing to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-links-to-free-spins-game-hack
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-coin-master-cards_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-cards-link_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/pig-master-coin-master-free-spin_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/www-claim-gg-to-earn-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-unlimited-spins_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-coin-master-game-without-root_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/robuxglobalcom_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-spins-on-coin-master-hack_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-pet-food_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-no-offers_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/games-that-give-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/rbxoffers-earn-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/roblox-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/static-moonactive-net-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a90.bin
40c9505f71feaedf8e5467d506836d32a768171af3eb6e440b6e2f66465e1002		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A90 25648 bytes
font_01_sfnt_off00008440.bin
38227f22c56e8db7fcd930f70334a55dc145d883d99f149f685c4c449ac5af35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8440 18056 bytes

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