Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b51022c632e2852…

MALICIOUS

PDF

35.7 KB Created: 2021-06-28 15:18:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 520d281fc9b3fef47ffd9e3e50b39f3b SHA-1: ef64a2c664385124babdfa61bf63b202d6ef1d77 SHA-256: 4b51022c632e285227bcacac827b4acdcfe8477453c948986226a1b89e19a533
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which point to other PDF files hosted on the 'anshingtek.com.tw' domain, suggesting a link farm or a method to distribute further malicious content. The document body itself promotes downloading game-related content, which is a common lure for users seeking cheats or hacks. The ML classifier strongly indicated maliciousness, and the presence of a large number of external links supports this assessment.

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.co/app/431946152/how-to-play-welcome-to-bloxburg-on-roblox-for-free-game-hack
    • https://anshingtek.com.tw/image/data/files/free-minecraft-texture-packs-java_GM479516143.pdf
    • https://anshingtek.com.tw/image/data/files/microsoft-bing-free-robux_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/hack-coin-master-online-without-human-verification_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/roblox-with-free-robux-apk_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/roblox-generator-no-human-verification_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/free-robux-hack_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/coin-master-hack-2021-ios-download_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/using-free-purchases-on-roblox_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spins-link_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/free-spins-coin-master-blogspot_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/roblox-deathrun-cheats_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/how-to-hack-roblox-flee-the-facility_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/coin-master-daily-free-spins-link-march-2021_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/how-do-i-get-free-robux_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/how-to-hack-roblox-jailbreak-new-hack-2021-working_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/roblox-hack-unlimited-robux-human-verification_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/free-roblox-card_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031af.bin
740b6795dcdc10b6f135bf83dcd38170babff50949ab9e1207409206c9789a8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x31AF 22828 bytes
font_01_sfnt_off000064cc.bin
4b121d35e5d2415e9e78c63abe801805e665ac942e1e1bb3ea73e4e652a63f90
pdf-font-stream PDF embedded font (sfnt) at offset 0x64CC 19748 bytes