Malicious PDF — malware analysis report

Static analysis result for SHA-256 80709061eab5e18d…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 03:54:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 50ddd72b0330c17dad26f89731b5ca8e SHA-1: a52d2be6e1f81c4f7b54590ce1eec4d829e2be88 SHA-256: 80709061eab5e18d57e25d22d0a03ac894b694ccbbccd8dec77aecbd4ea55c2a
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to game-related cheats and hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure further supports a malicious intent. The primary goal appears to be directing users to download potentially harmful applications or exploit kits.

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/apps-for-free-spins-on-coin-master-game-hack PDF link annotation
    • https://www.tw-storage.com.tw/upload/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-jailbreak-beta-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-have-the-gamepass-for-pet-simulator-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/project-alpha-5-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-draw-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/como-hackear-roblox-con-cheat-engine-68_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/cool-roblox-weapons-hack_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-phantom-forces-hack-for-all-guns_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-that-has-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/wall-hacks-and-aimbot-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-someone-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-content-deleted-pants-free_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-admin-free_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/comment-etre-hacker-sur-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/bux-life-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_off000030c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C1 22884 bytes
SHA-256: 80c6fff1e61f00a2db80fdfbca43d0af80cbae1626f7496942b296aae30741b7
font_01_sfnt_off0000642d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642D 18176 bytes
SHA-256: 4d8eb0f8a0ca3875223533dbcbb3aa7de45378118781519f1d2f46a8ca285011