Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c612f0546660720…

MALICIOUS

PDF

37.2 KB Created: 2020-08-25 18:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3d375f22ed5aaa1f4df203d1f0ed018 SHA-1: 755443c3fde7165c53c450bcd9d396ef5fb00032 SHA-256: 2c612f0546660720c8d34297cdf8bffdefbed796cbd1df5747fb0ed1ee2836d5
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic indicates these links point to a redirector infrastructure, likely to obscure the final malicious payload. The document body contains text that appears to be metadata rather than user-facing content, and the primary malicious indicator is the link farm designed to lead users to potentially harmful content. No scripts were extracted from this sample.

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.com/pify?keyword=biblia+de+america
    • http://files.thealpinerovers.com/uploads/1/3/1/0/131070646/ec1be4f6eaa.pdf
    • http://files.churchweddingspaphos.com/uploads/1/3/1/3/131382841/janida-dovududomaditi.pdf
    • http://befugilel.slaterphoto-graphic.com/uploads/1/3/1/3/131383839/gepubovod.pdf
    • http://files.nimueart.com.au/uploads/1/3/1/3/131380773/dusujagadevoge.pdf
    • http://files.nechesengineers.com/uploads/1/3/2/6/132683017/2256902.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/sanadudofemuxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/60321484345.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/28791931759.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7815/files/get_input_from_user_python.pdf
    • https://cdn.shopify.com/s/files/1/0430/1163/7401/files/9770378561.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/41224298356.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/ansiedad_estres_y_deporte_sara_marquez.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/15971112387.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/24928261399.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/sed_and_awk_command_in_unix_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/64844373009.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/hanover_insurance_company_claim_reporting.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_off00005337.bin
56e4b85c279cdb9eff390363f13ebdd945e8ba244bcb756b05789ed13d2cb8e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5337 5096 bytes
font_01_sfnt_off00006463.bin
3c1c04e22037076bdd1825988285b9dcf9c1a9095746dee529c371ccd8bdc7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6463 10588 bytes

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