Malicious PDF — malware analysis report

Static analysis result for SHA-256 988e6cca5eb14a1e…

MALICIOUS

PDF

48.0 KB Created: 2020-10-24 15:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 84c64823896323f2b1d3576484a5cec9 SHA-1: 076ab45fcef89db477231147cb7e50a3dfef1a54 SHA-256: 988e6cca5eb14a1eb7d537298bc0d236f6e3be9c56d43793076bca440e273b20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as part of a link farm. One critical heuristic indicates that PDF links point to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded content appears to be an attempt to disguise the malicious links as legitimate book-related material.

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/aws?keyword=andromeda+ethiopia+book+pdf In PDF document text
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/foxekit_puviforexexepe_naxolepedi.pdfIn PDF document text
    • https://guzuzixud.weebly.com/uploads/1/3/4/3/134357052/sitowurez_nofir_kupok.pdfIn PDF document text
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/gikemabudo-sosukuwirikixi-fenevepopuxori.pdfIn PDF document text
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/8738440.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/wifedewowenukutidi.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/xobafipat-lesajodelabi-ginizolimitosuj-petatokuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5f901c7e72d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5f925067e49a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f87d9cba11c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f8fb596271b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxulija/benzoato_de_sodio_que_es.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/zagen.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/phonics_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/causativa_en_ingles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/52910064137.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1263/5299/files/zejazab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/determinant_of_2x2_matrix_python.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4243/8809/files/greatland_outdoors_screened_tent_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4161/9100/files/gowawemevezuxerev.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/11420665901.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/vijuwuxedoza.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/fujifadefojopidud.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/wamif.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_off00007cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF6 5264 bytes
SHA-256: 81084d2918c2bd96cf93190ec61f804bbc200042d8b63da86548d691a0609169
font_01_sfnt_off00008eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAA 10624 bytes
SHA-256: 09afed761588febd37c25b14648ee982d26893012b1f92d641d9bc4ac71f4888

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