Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bc9431ad9902b2…

MALICIOUS

PDF

72.5 KB Created: 2020-10-27 10:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5a29e804f679c9705bbd5abee27d7a48 SHA-1: 174fedcdcae9127b89cf2cab496a697794783f63 SHA-256: 88bc9431ad9902b2f65c7d818c104d9539e3d62d88e190435a57c60d0417484f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=a+raisin+in+the+sun+text In PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/2119c0cb2bf4dc.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/7858fc4.pdfIn PDF document text
    • https://pasabegimukug.weebly.com/uploads/1/3/4/2/134265340/485a7f825544.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/diwepubik-mifurekuf.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/b3d2852d439.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/noxeb.pdfIn PDF document text
    • https://defejeve.weebly.com/uploads/1/3/4/3/134386135/gipemodisul-kokapusow-sategikoxun-kobonop.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/3722212.pdfIn PDF document text
    • https://xugirudubup.weebly.com/uploads/1/3/4/3/134332480/netibezizozam_sowatusekuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/norapafot.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/loragilegofonim.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/13430035305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9781a1-475b-42b7-98f2-535b96560173/8613231576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23644510-9888-4de4-a45d-826e4c464c81/javoxural.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f0aec3-9371-4ec0-8a14-db0b6c779d60/sefuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e82e81-f841-4d20-803b-2d60b8fd943d/68166306610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71f7323-e28f-4b0c-9a1e-d59f22683a95/22915442663.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/maxugar.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/balanceamento_de_equaes_qumicas.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/an_introduction_to_statistical_methods_and_data_analysis_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/calendario_2019_mexico_oficial.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/storyboard_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/alternate_segment_theorem_proof.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000d5e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD5E5 26392 bytes
SHA-256: 8b60cb7007ae1f2f4f2f6651802f4d447748dc3597c197dcda4a9f32f66ced4e
font_00_sfnt_off0000a0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A5 4568 bytes
SHA-256: dcb75909b7ecd91ebfcd281c321009421fef07591bb1f5d90660ab6c097a025f
font_01_sfnt_off0000b010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB010 11160 bytes
SHA-256: 11850107578c69b00f79c680c30ad02fbbfed3989ef3ce9b7373829945344ae6
font_03_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2