Malicious PDF — malware analysis report

Static analysis result for SHA-256 a314796f431775d7…

MALICIOUS

PDF

34.8 KB Created: 2021-06-30 06:54:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 53fb577c9eded142cdf06c5b0f5948df SHA-1: 1ddc028fa8e48e4574dcf881558f28228b1e21b3 SHA-256: a314796f431775d7104ec12802de7160fbade59719857b380af7efd9335d0a4d
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are presented as downloadable files related to game cheats and hacks. The presence of a "download button" heuristic and a large number of external links suggests a deceptive lure to encourage users to download further malicious content. The ML classifier also strongly indicated maliciousness.

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/april-1st-stickmasterluke-hack-face-roblox-game-hack
    • https://humansci.kyst.com.tw/image/data/files/free-robux-script_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/free-robux-rewards_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-daily-free-spins-2021_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/roblox-how-to-get-free-robux-without-hacking_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/is-there-a-real-way-to-get-free-robux_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/gamehunters-club-coin-master_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-bc-in-roblox-for-free_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/dance-routine-hack-for-roblox-high-school_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-heaven-free-spins-today_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/free-spins-coin-master-links-blogspot_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/robux-hack-no-download-or-human-verification_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/how-to-hack-roblox-android-step-by-step-anddoid_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/code-code-robux-hack_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/roblox-hack-me_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-gold-cards-link_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/minecraft-windows-10-key-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000308b.bin
8c6cfc390337d0ff582eaf8de57ade48f8c93a49c2b857aab853630842286aaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x308B 22120 bytes
font_01_sfnt_off00006132.bin
9198c24fbae1bd75d94e291f46593c971948ff21a733e99ad3c2fa6a19f1e83e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6132 19724 bytes