Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de4902f143226f8…

MALICIOUS

PDF

38.7 KB Created: 2020-08-22 20:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f95b9e6ed5a0dd907da74d4feea62552 SHA-1: 9d3e69ca4a4dc3ba755c1000480c4202aec619bd SHA-256: 6de4902f143226f8c34b3629c1dca845f78c93af7bcdec61927f36cdc3a843f4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Zero conditional sentences worksheets' and the malicious URL, suggesting a lure to disguise malicious activity. The presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic strongly indicate an attempt to redirect the user to harmful 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.com/pify?keyword=zero+conditional+sentences+worksheets
    • http://files.amandabeekhuizen.com/uploads/1/3/0/7/130775690/d5ff23774ec07bf.pdf
    • http://sedox.myslickpic.com/uploads/1/3/0/8/130874063/bepaluwumegi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/70435952779.pdf
    • https://cdn.shopify.com/s/files/1/0440/8868/8790/files/business_english_and_communication_by_clark.pdf
    • https://cdn.shopify.com/s/files/1/0438/3513/0018/files/tukar.pdf
    • https://cdn.shopify.com/s/files/1/0438/5862/4672/files/tiripewewugipavet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/mmpi_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0437/4695/1319/files/report_illegal_dumping_hazardous_waste.pdf
    • https://cdn.shopify.com/s/files/1/0435/8589/6609/files/jisazototabuporipenawane.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/viwawetemipirexejigisine.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/14434660652.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/69471976602.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/95961515045.pdf
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/82632016967.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1463/files/16106649491.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000580e.bin
00447900e3f7efc007b9aac7a5f2589b998e521978c74d7c0ab0c8831a3d47e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x580E 5140 bytes
font_01_sfnt_off0000698f.bin
a376aa07b60074964f8b7259f58c2c28eeea931f82723474654dea264fe091bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698F 10124 bytes

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