Malicious PDF — malware analysis report

Static analysis result for SHA-256 763eab00684009d4…

MALICIOUS

PDF

39.1 KB Created: 2020-09-03 02:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 551043212282672fee229ee8dc29e516 SHA-1: a078136d6dc569ce8128d14b99066eccac2678cb SHA-256: 763eab00684009d4588d75bf464901911ef807d1f5774549ac18c9612180e5da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector service that hosts a link farm. The primary redirector URL is `https://ttraff.link/wix?keyword=apostolic+preaching+s`. The document body itself is heavily obfuscated and appears to contain metadata related to its generation by wkhtmltopdf, suggesting it was programmatically created to host these links. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=apostolic+preaching+s
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/93971e_af002f2e1e274d4ead7b01acbeee82bd.pdf
    • https://static.usrfiles.com/ugd/8ff694_e020b3d3a7414e9fb5881aa8f66c0514.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd4141fcf85948148f7b269342f39ab0.pdf
    • https://static.usrfiles.com/ugd/cf79db_842a6041c947428087b1899fe0bd5725.pdf
    • https://static.usrfiles.com/ugd/4479ed_5a6c01ae241c40448087212466ec99bc.pdf
    • https://static.usrfiles.com/ugd/bcd086_71bbf276f26b4a16aacf359266f64fa8.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0021/files/49081692198.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6845/files/jewoxabewezarivibaw.pdf
    • https://cdn.shopify.com/s/files/1/0463/3119/9645/files/aihw_report_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/6787/5228/files/15933362165.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6853/files/zumeduromojazataneve.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c4f.bin
3a1861109f424a6447e7928bc0b8a8583cc10c6c173a81f53e8a3d69b332be4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4F 5184 bytes
font_01_sfnt_off00006dec.bin
a3e80d12e42710c012e7804fb28d178251fb1b7948e0662199d5ad24d390c7d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEC 9988 bytes