Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bb7ff0d7eb4e8d…

MALICIOUS

PDF

32.7 KB Created: 2020-09-19 10:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf82686f20985cfff28eac843779dcef SHA-1: d26b0728b497e09d29a03a55af8e815f6ee5efe4 SHA-256: 83bb7ff0d7eb4e8d8307ff2cf160badafccd2bfa848f8e50602b81a13bdb35c3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The primary malicious URL, 'https://ttraff.link/wix?keyword=the+man+in+the+water+answers', is a clear indicator of malicious intent. The document body is heavily obfuscated and contains what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

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.link/wix?keyword=the+man+in+the+water+answers
    • http://zexake.nortonshoresparks.org/uploads/1/3/1/8/131856725/6535235.pdf
    • http://sepadexo.potterplacefarm.com/uploads/1/3/1/6/131637352/8729504.pdf
    • http://files.theveggietaste.com/uploads/1/3/1/4/131455722/fugokolewojo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/list_of_architecture_colleges_in_pune.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/16818917314.pdf
    • https://9fcb4a55-eaf9-4809-926d-603800269643.filesusr.com/ugd/ac1638_c70952fd41264360bed43b1540faa74d.pdf?index=true
    • https://9688388c-c70d-4557-be88-8fc883007d32.filesusr.com/ugd/c4dbd3_c59d872d785840bb9937908f41ffd7f1.pdf?index=true
    • https://0fc261db-2c07-4bbd-ac47-e5c9e726a6aa.filesusr.com/ugd/359e64_abf4a1c3c0a74023846adebcaedefc7b.pdf?index=true
    • https://74e3db6a-cb4f-403b-93ba-91f8778cdfec.filesusr.com/ugd/54fa57_9c9bfed22ed64474a0d2425f3b144922.pdf?index=true
    • https://a1b3d1c9-b14d-41f7-b70a-fec4b9f64628.filesusr.com/ugd/1c8c1e_41e10458ec804f198936ee7ca99a1786.pdf?index=true
    • https://a95efe8c-e0ac-48b2-824a-eade3ce19d22.filesusr.com/ugd/08338c_fd683e1cc0b143669ab452a1af269cbc.pdf?index=true
    • https://66650b4f-109b-4b81-8625-f473d5f1ad13.filesusr.com/ugd/145364_3b9196b51fd4422ca69e52d2b71acc1b.pdf?index=true
    • https://e93beb5e-46ed-4091-a7c6-223cfdd67a8a.filesusr.com/ugd/d90490_72a92638ff3547789839f80a66c1cf67.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_off0000442a.bin
648a742e4e65d7682f50738be723739d5b8a410a8d78f0cf6a2f1691a35a2aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x442A 4936 bytes
font_01_sfnt_off000054cd.bin
bd2e42e8f0a2a15d6950a2f70dd2e9a28b12c968801b3eef49e49301135d7b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54CD 9920 bytes

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