Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf6692e8174ca10…

MALICIOUS

PDF

42.7 KB Created: 2020-09-19 05:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d16a2304c62a1f642fe7ea6980e99b90 SHA-1: f9bd70ee6919ecd22616ed2b38756a23fffddd30 SHA-256: 4bf6692e8174ca10653f05b5063f7fa2a4eac4c794b1653e18d12988cecc69dc
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body text, though garbled, includes the target URL for the lure, suggesting a social engineering attempt to trick users into clicking malicious links. The ML classifier strongly indicates maliciousness.

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=toastmasters+competent+communicator+manual+speech+9
    • https://bf1b1a07-7471-4358-861e-fa8ab0472ac5.filesusr.com/ugd/c83fdb_5ad80b60f6dc474186238c3ceec45edb.pdf?index=true
    • https://fd6febab-4e45-404d-8c96-f099b9bb50e3.filesusr.com/ugd/007d40_9432017a60d34664a92023d115ff1028.pdf?index=true
    • https://474744ae-aa9e-4b12-bf30-11847591ec2b.filesusr.com/ugd/9cb112_68f7ff9781344cc59271d2e9ce7d0db7.pdf?index=true
    • https://f7945e68-942e-4014-add0-f499ffdc6fe4.filesusr.com/ugd/d19ca0_a6f364a7d3b64dd1bf584901b7c91e47.pdf?index=true
    • https://7681f8cb-6432-4883-8bce-3f23cad3e375.filesusr.com/ugd/8a4248_dacbefef80144c28a62fbf3d404f35d7.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/felamisakawubibaxejurelok.pdf
    • https://cdn.shopify.com/s/files/1/0437/8250/4600/files/wastewater_treatment_plant_project.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/einstellungstest_agentur_fr_arbeit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/cablevision_flow_apk_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8284/files/29622002993.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/83072188373.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/82033704404.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/32916395558.pdf
    • https://cdn.shopify.com/s/files/1/0430/1901/0201/files/98203104905.pdf
    • https://d2572159-a868-4a55-b728-9d698d8c9bad.filesusr.com/ugd/3de8a6_fa74949ff96b43b8ae0c9feeed4bff3f.pdf?index=true
    • https://3b93a53f-7ac2-48dc-b474-317baee0c206.filesusr.com/ugd/33a2e4_8ea665e717d443f8b54d6eb02f584944.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_off00006938.bin
a210e5a82a66a840ea330019bf41ad8ce8159c66639f30e9d78beb05c320228e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6938 5276 bytes
font_01_sfnt_off00007af9.bin
b3c9f9afdfa8e061adc42cb506aa42af8d10f98ca120e375ff18bc0a4f0139c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF9 10080 bytes

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