Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc262c40fd48ed0…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 10:39:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 75f46e93a371b9a4426843b061789968 SHA-1: 24febf8dc80c9ffbcef4f6e23ca1d28af9e1124c SHA-256: 5bc262c40fd48ed0284312cbf2506a8b47c4a1b78cada09718702f5eb93550ef
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm designed to attract users searching for game cheats and free in-game items. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the malicious intent. The primary goal appears to be directing users to download further content, likely malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-heaven-free-spins-today-game-hack PDF link annotation
    • http://foo.com.tw/files/cruise-ship-tycoon-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/obbys-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-18_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-hack-exploit-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/paginas-de-hacks-de-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/increible-hack-robux-pastebincom_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-tiktok-likes-no-human-verification_GM835599320.pdfIn PDF document text
    • http://foo.com.tw/files/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-come_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-my-boyfriend-cheated-on-me_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/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
stream_002_off00003156.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3156 22904 bytes
SHA-256: df2956e3668fd3e2facc2caed0dfde0e724ac874c78c5806f42c231f5153469e
font_01_sfnt_off000064b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 18640 bytes
SHA-256: 3d9153b17c01349321dbf9895197e00a389ef43fe3f4ac06fe2a253dcac379fc