Malicious PDF — malware analysis report

Static analysis result for SHA-256 16def953796fed44…

MALICIOUS

PDF

43.1 KB Created: 2020-08-30 23:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d648d8199c2bde844e86dd0dd517930 SHA-1: e8fd70be7ea367336cdca87a57bd8d2c43d83de9 SHA-256: 16def953796fed4410fc25792d54f9dd3dd8ad5b985e6f98a9d9a746d5ce6126
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, one of which, 'https://ttraff.cc/wix?keyword=terraria+1.3.5.3+seeds', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDF links, suggesting a lure to download potentially malicious content. The ML classifier strongly indicates maliciousness, supporting the redirector finding.

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=terraria+1.3.5.3+seeds
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/security_bank_loan_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0452/5395/1650/files/australian_slang_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0040/files/disjunctive_syllogism_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/zolijopokoviduwagazof.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcc0cc1e0227497490770403dbc9ede9.pdf
    • https://static.usrfiles.com/ugd/b8c837_03d499f51e7b4a1eb8ad2d3b9e66bfb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_275931a6218d46978e50a8921bcc6fe1.pdf
    • https://static.usrfiles.com/ugd/b8c837_45efedfe25864268ad47df863318a9b9.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/8369881781.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/domamusuvusuzexi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/wetupe.pdf
    • https://cdn.shopify.com/s/files/1/0463/3375/5549/files/invisible_inc_draco_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/zomokutodulatenagakaki.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/pototepub.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_off00006b82.bin
975d8afd291d9c856abad6518a5b534d41b0074a8538e8144e9ac24300cdeb1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B82 5108 bytes
font_01_sfnt_off00007cfc.bin
6b7da2d46ffa108750e87d0d2a5d9ad810a1b0d4a4451b91a393820ae2360242
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFC 10100 bytes