Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a31cdc8e66e42c…

MALICIOUS

PDF

92.4 KB Created: 2020-08-30 05:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aec88a543019176c49d973c8a4a9750 SHA-1: 771848365cda52e6c363bdc6a16f6b0bbb0ca63e SHA-256: 00a31cdc8e66e42c56970a5dcc4b818e915e1e672b600b0ce0ad92492a2da01e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm designed to lead users to malicious content.

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.com/wix?keyword=kamen+ex+aid+all+henshin
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/05900a_776ff052847f48ba8d38736782589e6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d29c27e147c94f83a57bab91cceceba3.pdf
    • https://static.usrfiles.com/ugd/5926b4_f12db5efdc30495aa3d034d3daa974d9.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/90317843875.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/72473714230.pdf
    • https://cdn.shopify.com/s/files/1/0432/7964/6878/files/vizilapivumofalebikoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/guide_escalade_dentelles_de_montmirail.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0439/files/64203642033.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1ffb517261f4ccfa867406991f5cb14.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7112932bd574c32bcf9b88ad9cab949.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_ee7f832472b34dcb931971088e00757b.pdf
    • https://static.usrfiles.com/ugd/7603ae_65f2f420d8c44d868557b4c06c6214f4.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000883a.bin
513d49ed157dfbc16d71f14a3e93c7428bf85f514ba9919395a8c684d84ab07f
pdf-font-stream PDF embedded font (sfnt) at offset 0x883A 47492 bytes
font_01_sfnt_off000118b4.bin
9461f9df92a89a1e4f9d99cd953b040f1447bc29c1106b1a8592a778594498b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 5004 bytes
font_02_sfnt_off00012995.bin
1b7a3db12e7a618158c0a28e8470edc9fdc1cce1e283bcb5b40e304d4297c77b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 22708 bytes