Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5d1ffce5fc96fe…

MALICIOUS

PDF

39.7 KB Created: 2020-09-21 07:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13283ce00afdab4bc2125036193bd888 SHA-1: 2d22212fe069df76a4d2f6a9afbef8d0ac666e95 SHA-256: da5d1ffce5fc96fea9bcc6c577e68d8c5deafd66f0cc72cd29cff3581e603254
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to a URL that is known to host malicious redirector infrastructure. The document also contains a large number of embedded links, many pointing to Shopify domains, likely as part of a link farm to improve SEO for malicious content.

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=whiskey+words+and+a+shovel+pdf+online+free
    • https://cdn.shopify.com/s/files/1/0438/7287/8747/files/13855762052.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/51468598251.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4261/files/pirate_bay_proxy_list_2020_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0428/6221/5324/files/2594876522.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/systematic_theology_free_download_grudem.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/business_plan_sample_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/jijusifapepifopavaxul.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/10725608114.pdf
    • https://e8bc54f2-b719-45f2-9b9f-068a4578d367.filesusr.com/ugd/79cb75_4974f962154c44fca780d2f5107d5f43.pdf?index=true
    • https://fa4c1149-1aa0-4231-8e14-5fc7020b598c.filesusr.com/ugd/73f3b0_8c2358c75ed24488af70f9ab35025d74.pdf?index=true
    • https://d6cce384-cd03-43fb-94d0-78f291846d8f.filesusr.com/ugd/1d3654_f4b167d92e3b44e5bdf33f33c667e12a.pdf?index=true
    • https://6572401f-5bf1-474f-85ff-d98462afc807.filesusr.com/ugd/83e584_abefc389d7c84442ba4bae9992108d39.pdf?index=true
    • https://6b0afa14-5791-4e2d-aea4-bba2373152ac.filesusr.com/ugd/1df9ea_8d83a6f9ff5348cca4d8acd2c38714ef.pdf?index=true
    • https://9db6478e-410e-44d9-81e6-a0c62ed0fc12.filesusr.com/ugd/112488_dac30b3bbcc44c588a1e1d9826bc90a9.pdf?index=true
    • https://39d92630-26ef-4dc0-bcde-a9ab52348b49.filesusr.com/ugd/9ced5d_ab87b8eb9aa84fd5b2c7ce2ec5b13f6d.pdf?index=true
    • 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_off00005cd8.bin
3869b9ff2d55c8ea08dd4d1c35932898cdb315f900cde06c5f259c190252b892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD8 5460 bytes
font_01_sfnt_off00006f87.bin
3318f42cf9971d710d4d4bb469eaff668dbe180f7926729b07c0194df77ac475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F87 10116 bytes

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