Malicious PDF — malware analysis report

Static analysis result for SHA-256 67584d5a33e6509f…

MALICIOUS

PDF

44.3 KB Created: 2020-09-02 01:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3cf378b272c676f81d74205d3fa5526 SHA-1: 39fcab20249dc51a89cb812b2f6078ceaaf0c0cb SHA-256: 67584d5a33e6509fb4cd3a416d0b742375f50918a23e2c13a438b25273a61dc8
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The presence of numerous external PDF links, many of which are benign, suggests a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users.

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=python+dictionary+formatter+online
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_621b0997712c45ac8e5f9ffee7e6cac4.pdf
    • https://static.usrfiles.com/ugd/defdb4_fb0dc4af73d9457caae8e4528d4ad2ad.pdf
    • https://static.usrfiles.com/ugd/880a7e_e0f42ceb54a341539e08e90e7573f920.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/isda_master_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/18008101771.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/computer_programmer_resume.pdf
    • https://static.usrfiles.com/ugd/89c6ad_bca27f0c4df94cb0808ff37f8025e76d.pdf
    • https://static.usrfiles.com/ugd/ef7486_da956e631cda434aa6aa1e53d7da61ab.pdf
    • https://static.usrfiles.com/ugd/191a6d_1c05e4811efe4ed09bd378f02a469530.pdf
    • https://static.usrfiles.com/ugd/77d535_efaaf762a83e44e0b5c1a9ab1f879532.pdf
    • https://static.usrfiles.com/ugd/8e1900_90ddd2a2a7b544fe818bf75b2a908357.pdf
    • https://static.usrfiles.com/ugd/edb4a7_b340a1ba748644deab205cb2ca1941ab.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_off000060c1.bin
1e0b53af851ccfa079200487ae6d254c17e67be5c17b65bd9a0a5d4198919d61
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C1 5184 bytes
font_01_sfnt_off00007243.bin
d31ac4c3692d04975461adfee4db7366871516a317b77419940318a1e3567b26
pdf-font-stream PDF embedded font (sfnt) at offset 0x7243 15348 bytes