Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83df46eac487b71…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 15:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e80380d918156d1d44cbbe65acc5529f SHA-1: e52425675790c69b28ff69997ff3090f522f6358 SHA-256: a83df46eac487b7188b1f886d5a9f5d1c831db9f635ef909f9cbf2912ff25025
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a malicious redirector link disguised as information about 'corel draw' window elements. The primary malicious URL, https://ttraff.cc/wix?keyword=elementos+de+la+ventana+de+corel+draw, is flagged as a known malicious redirector. The document also functions as a link farm, pointing to numerous PDFs hosted on static.usrfiles.com, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://ttraff.cc/wix?keyword=elementos+de+la+ventana+de+corel+draw
    • https://static.usrfiles.com/ugd/5360f8_869cfb7be74d4a46831bb5503e9090b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_699892ac357241d5b7e9cd3e6467d43f.pdf
    • https://static.usrfiles.com/ugd/80c1db_654aacf805df4b8eb7ff3b11fd5031a3.pdf
    • https://static.usrfiles.com/ugd/accd1f_ed2c7efcb3ce4f87b64095adf4800bf1.pdf
    • https://static.usrfiles.com/ugd/8b97dd_e318e3e07f7743eca5a7f5b5d90edccb.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d075c833b8c441498b884f0f9adf0fa.pdf
    • https://static.usrfiles.com/ugd/b7306e_8105d3346a88447bba86946f04fe278c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f55d30d1969493a8c846f735179d617.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/12926943070.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2545/files/how_to_download_jw_player_videos.pdf
    • https://static.usrfiles.com/ugd/599026_28c8f3822fdc427baaad7c3d2a322e69.pdf
    • https://static.usrfiles.com/ugd/b8c837_543d269272a24a689d5f9a5bbf8546a8.pdf
    • https://static.usrfiles.com/ugd/299074_7b7def9478674cbca6ed0a2dd5beb2a5.pdf
    • https://static.usrfiles.com/ugd/b9801a_861c7bf2ac9f472f9ed65c80276a4c3c.pdf
    • https://static.usrfiles.com/ugd/cac9e4_441ae8dd4f2e4e3ea6cf178a911c678e.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061da.bin
b7921292b520e1d7689a9c16d1c39adb49d01506819c779e773d65c6ab583813
pdf-font-stream PDF embedded font (sfnt) at offset 0x61DA 5192 bytes
font_01_sfnt_off00007383.bin
3e15187d91c241f8227ace8218e86f77ae537125b15d9504c376831e7b1c51a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7383 10588 bytes