Malicious PDF — malware analysis report

Static analysis result for SHA-256 91da50004ccb5e1c…

MALICIOUS

PDF

41.6 KB Created: 2020-08-29 18:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 189b7bb4cacb702ed80f0c499c7f06a6 SHA-1: 7a790d34cf903076c369bdcac353bb7195a2bdf2 SHA-256: 91da50004ccb5e1c3351abe622aab47cb3d45baa665f577d3033f03f0779322a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to distribute malicious content or phish users. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious IOC is the redirector URL.

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=circular+and+satellite+motion+weight
    • https://static.usrfiles.com/ugd/b8c837_c0baa625869d476482b5754e6ae6e8d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cad664b32c740599c559bfef1fdb2b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a23303dda1464c76afcaca4c6ccba19b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2a807880bc94fa796a6c93447feb93f.pdf
    • https://cdn.shopify.com/s/files/1/0465/2888/8982/files/after_effects_free_intro_templates.pdf
    • https://cdn.shopify.com/s/files/1/0434/7589/4437/files/genetics_from_genes_to_genomes_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/2581/5959/files/commando_behind_enemy_lines_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/90626884386.pdf
    • https://cdn.shopify.com/s/files/1/0439/4529/6027/files/29540268448.pdf
    • https://static.usrfiles.com/ugd/b8c837_354df30bc46644f79a13d221175f54f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dae6cf70624488d80d3fba796d71520.pdf
    • https://static.usrfiles.com/ugd/b8c837_afdefb3419d94fc1a92d2b0a2afabdb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_03b79bbc41cb40b0a2e6c983721a8b59.pdf
    • https://static.usrfiles.com/ugd/b8c837_020fe300be4e4cbbadafe8ae2b3033d0.pdf
    • https://static.usrfiles.com/ugd/b5aed9_2e17176fadc84172bf132bc5469dce2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e866402209b4a83b948a68f0bf0a07d.pdf
    • https://static.usrfiles.com/ugd/9c43ec_4b5f9eecfe514656a2d129a3a6cafbe3.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_off00005c7c.bin
f0bbe7986d710eb8bc7ee2af7c7ed2e28eb7ac531a696ef23e7b0096d7174952
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7C 5348 bytes
font_01_sfnt_off00006e85.bin
9a5d56eb5e2891e86c30f1db883ff99d289765f912f5fb07d2239eed4f99bc74
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E85 13744 bytes