Malicious PDF — malware analysis report

Static analysis result for SHA-256 038084f319beaaac…

MALICIOUS

PDF

72.1 KB Created: 2020-10-31 05:20:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d54a513f9f6a2ad9b48717eaaf5808a3 SHA-1: b7314ddf6bcadb2e4cf30708dcac568d68e13226 SHA-256: 038084f319beaaacb0c2f7d32c3d48302d02294cc8f83cd2e69e278bc3751511
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm used for SEO poisoning or distributing further malicious 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://ggtraff.ru/123?keyword=pull+ups+age+chart In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f874b1cafeef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_5f9816e51f79c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5f98242180c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5f8f9cba34550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f914ff327bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f998a15efe31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0210dfad-b71b-432f-a00a-fd94965bb886/jim_crow_laws_vs_black_codes_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/retivarinimabetonarinutax.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/eicar_test_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a9be18-ddbd-490a-adf7-83705340ef4e/29219144964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05106aaa-292c-484d-938d-5ef85d3f9c46/13796776488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23287131-7b65-480c-9e5d-90d54d5def7e/gusubopiporelaraledodago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2812/3295/files/android_studio_linearlayout_divider.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/volunteer_mortgage_loan_servicing_email.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8929/2184/files/endocrine_system_worksheet_key.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 5196 bytes
SHA-256: 028663d851a2319c4546dc02aafe9fc4e5a6eeb30ceecc6feb8499873e65660c
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 11920 bytes
SHA-256: 881b8569328d14dd6f1bccf007acafed17ac301696f24c45bcdd5b56f2601941

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