Malicious PDF — malware analysis report

Static analysis result for SHA-256 5735a23b8d6e8fe9…

MALICIOUS

PDF

35.2 KB Created: 2021-07-08 10:48:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4fccfe8ff6f84d06df6a045c66105e99 SHA-1: 6ce57dde0f54a3058a3c73bb58f98b84a8136e99 SHA-256: 5735a23b8d6e8fe99830071c11f3126b4c8135ed7407d5b4f2100b91443fde8e
102 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to attract users searching for game cheats and free in-game currency. The document body and extracted URLs explicitly mention 'Free Robux' and similar lures, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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/431946152/free-robux-that-actually-works-game-hack
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-free-spins-link-cheat_GM406889139.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/daily-free-spins-on-coin-master_GM406889139.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/dominus-hat-for-free-in-roblox-catalog_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/how-to-get-free-robux-safely_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/aristois-minecraft-hack_GM479516143.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/free-roblox-website_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/free-roblox-accounts-2021-with-pin_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-hack-mobile_GM406889139.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/how-to-get-free-robux-2021-december-2021_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-codes-2021-real_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/all-roblox-dance-hacks_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/clean-master-free-coins-and-spins_GM406889139.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-no-downloading-apps_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-on-phone_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/roblox-champion-tshirt-free_GM431946152.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • https://ciptawiratirta.com/assets/CKImages/files/instant-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000326f.bin
03eb6d4433626581c2d02d45321b9a662130c8a5f290bc3def1f4834def3ae2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x326F 21980 bytes
font_01_sfnt_off000062fa.bin
d52712f1a35e8680be3c45e78173014feb66661a2560c5e73c6934237b8ae3d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x62FA 19608 bytes