Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd330acde32c380…

MALICIOUS

PDF

45.6 KB Created: 2020-08-31 21:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1250ab13cd76d0d3d2507e879f917e2 SHA-1: 1edbcf004edd4e96b9b6a9f23f8d8fe2b52b629c SHA-256: 9bd330acde32c380b1624c115b98efa78dd6be7b5de3867d527b9d20869b5c17
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, including one to a known malicious redirector at `https://ttraff.club/wix?keyword=cornell+note+taking+template+evernote`. This URL is likely used to deliver a secondary payload or redirect the user to a phishing site. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document.

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.club/wix?keyword=cornell+note+taking+template+evernote
    • https://cdn.shopify.com/s/files/1/0432/9563/7659/files/aprilaire_700_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/conde_cagliostro.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/nowetakibev.pdf
    • https://static.usrfiles.com/ugd/83f04e_f93588e5486646058f9e7a0164c4c781.pdf
    • https://static.usrfiles.com/ugd/299074_4a7ffe7a99c043f597c2ad6e219e5b0a.pdf
    • https://static.usrfiles.com/ugd/902d29_20af8b829a9f454a81995539d77c6f20.pdf
    • https://static.usrfiles.com/ugd/5ad03d_4edd601ffe7c4437a1cb3fa0351a133d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c84418c1503d410ba113c80ac25457ed.pdf
    • https://static.usrfiles.com/ugd/dcfb95_3e4835f44db54aba8331daf662ebf280.pdf
    • https://static.usrfiles.com/ugd/a31856_acc49b242ca24a6c9bed6704bb6e7536.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3534/files/encantadora_de_bebs.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9517/files/briggs_and_stratton_140cc_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/46361465232.pdf
    • https://cdn.shopify.com/s/files/1/0440/3858/6518/files/actuarial_tables_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/kudoda.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_off0000760f.bin
b939a64d184d391fb8d3748b2f0e63f0a65b93e75e0365523ad031f147503627
pdf-font-stream PDF embedded font (sfnt) at offset 0x760F 4988 bytes
font_01_sfnt_off000086f4.bin
c004bf2e0fb1f1b922fdaecee65ea3521184043649ec84e595954572714e6f7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x86F4 10148 bytes