Malicious PDF — malware analysis report

Static analysis result for SHA-256 025f4b70a5a664d7…

MALICIOUS

PDF

67.4 KB Created: 2020-09-17 17:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 014f8a11b9f97803a3d045c8b2121eab SHA-1: 21382e93aae6863604ac01a1f5a824b773c87252 SHA-256: 025f4b70a5a664d7faff99b819c75c92af759826e44ff462e86389c0f359f4f3
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a link farm. The document body, though heavily obfuscated, contains the same URL. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to deliver a secondary payload.

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=best+muscle+building+stacks
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://df0af89a-881d-4546-86cf-e7b1b8c30572.filesusr.com/ugd/595093_ab3fce2e98f34c109f70fb9f2e7e7bc2.pdf?index=true
    • https://d9bb0c13-6b4d-4420-9064-c7dd3d14fa47.filesusr.com/ugd/5b1e3c_a9b6c79b3790471fb8434fa40275371b.pdf?index=true
    • https://22ae9a70-d667-4390-a095-b7cb149e5858.filesusr.com/ugd/64bd79_de73594fe7ca4383a0ad9aecf1163653.pdf?index=true
    • https://fbc7a084-d948-439e-8b6e-235ef7394216.filesusr.com/ugd/35e1ce_f397df4bbe7b4b88ad1904958b1eef48.pdf?index=true
    • https://ee4c03a2-fd3d-4ba9-895a-3de0f37f7087.filesusr.com/ugd/50de67_70f40092cf7047f28709a64b00fce57e.pdf?index=true
    • https://2b0c25f9-9985-4733-a2bd-dcd42dd94061.filesusr.com/ugd/234f58_c3b115c32af2483ba025c00972ec6c56.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/vunibigu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5324/3806/files/free_action_movies_3gp.pdf
    • https://cdn.shopify.com/s/files/1/0439/1347/8312/files/20609225060.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevedizulav.pdf
    • https://d02d77f8-9cdc-4618-93d1-d8f1a15d6c43.filesusr.com/ugd/89602e_35f74408486d405eb79f30a428a9bc79.pdf?index=true
    • https://f82bd923-e5d8-4470-832b-17a45f6027fc.filesusr.com/ugd/229b11_522b833ab590426abc418227b66cf188.pdf?index=true
    • https://c2f5635b-9c52-487c-bcc7-3b7e8c62b49c.filesusr.com/ugd/c068f8_c320bb4114d042b2ac6891715a84a7a8.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d4.bin
b90051723bbd91ffea17c2ddf2bcc29044d3121663652528573c0e18ba9031ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 5416 bytes
font_01_sfnt_off0000dc2f.bin
d9b0deccd0b5087aef3246c1b2687830827dc203d730bac04b4a0e93d4e540c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 10708 bytes

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