Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1786354b46b0f71…

MALICIOUS

PDF

46.9 KB Created: 2020-10-28 07:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b537c85d4b18ea02c7de1f1a03018a0 SHA-1: 1db1075b8be4cf09b13e7b3cd8869305f4bebbfd SHA-256: b1786354b46b0f71297afb55490fd359cee2794581e620fe2c2cecf2daf55af9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier also flagged this PDF as malicious. The embedded links suggest an attempt to drive traffic to potentially harmful websites, possibly for SEO manipulation or to distribute further malware.

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=west+virginia+counties+without+building+codes
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/nokuzivorif-zedobepizodeti-jasebijajonixo-zidona.pdf
    • https://nojarotawufa.weebly.com/uploads/1/3/4/3/134313922/xulededibotek.pdf
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/rojezumadizetazaj.pdf
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f8703f0eefc7.pdf
    • https://cdn-cms.f-static.net/uploads/4420476/normal_5f98d16d7a969.pdf
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f871d691b9ee.pdf
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f9274c8a8f43.pdf
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f8d6feab8e25.pdf
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5f88d5f3e179f.pdf
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5f9098a222199.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f91f240ac2c5.pdf
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f9369d4051fa.pdf
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f94dde36bbac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e135f0ee-7151-40e0-afeb-0e383411257b/jerri_mason_whittaker.pdf
    • https://uploads.strikinglycdn.com/files/05c507ff-b513-4533-b84b-0e439c6a14dd/1531268873.pdf
    • https://uploads.strikinglycdn.com/files/c675f20c-e70f-4e45-ad55-a85028d8096f/vagodupukamegexaxan.pdf
    • https://uploads.strikinglycdn.com/files/782b2db9-a8ec-4255-b891-4e75e3d7d605/guajira_flamenco.pdf
    • https://uploads.strikinglycdn.com/files/257a5493-e4ca-4853-8323-dd2e9710e6fe/27503059755.pdf
    • https://s3.amazonaws.com/xanebavifamopez/22579982934.pdf
    • https://s3.amazonaws.com/bubeto/swing_low_sweet_chariot_satb.pdf
    • https://s3.amazonaws.com/pazifetanegapu/como_cambiar_un_documento_de_a_word_sin_programas.pdf
    • https://s3.amazonaws.com/xajowu/joint_and_marginal_probability.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_off000078be.bin
2fbf446e721d2d25babed57490c39c92e18efd67bdc2ee1d39ffe0f4e85897eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BE 5504 bytes
font_01_sfnt_off00008b85.bin
f373808a45fb2fbb5f0cb0b652198325730527333a7b4f0d0b8468127e8e4a82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B85 10056 bytes

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