Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bf0a84687b9011…

MALICIOUS

PDF

45.7 KB Created: 2020-11-01 06:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2d932a65e9f88e7c7ddf9cd8c2b57f15 SHA-1: be05e891566a4fcfa57bfde7031ac914ffa9f3c8 SHA-256: c8bf0a84687b9011a6230f0d195fbbf9470adedab01a730f2c5e4427ca63298a
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link-farming or content distribution scheme. The presence of a malicious redirector URL points towards an attempt to lead users to harmful content or exploit kits.

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://gettraff.ru/aws?keyword=%25241+bash+shell In PDF document text
    • https://pativezakuzorad.weebly.com/uploads/1/3/4/2/134266084/kisuxirukav.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/noxokizug_vonadamobal_xarurululilen.pdfIn PDF document text
    • https://degitigurot.weebly.com/uploads/1/3/4/3/134337886/363f8f67a094.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/baposivarabuj/vorusamiwakutadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/4141/3032/files/19686477641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3912/7229/files/nekuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4524/3048/files/nebuximupuxijunasafonoza.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/zizinemixovaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/temperament_and_atypical_behavior_scale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8209/6033/files/lose_40_pounds_in_2_months_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/tikoxifasajiluveluxiti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5067/8464/files/free_energy_generator_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/common_idioms_and_phrases_for_ielts.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/dimojiparupumulak.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_off000071d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71D4 5012 bytes
SHA-256: 352799d79751aac4c42f49f2b678b29eeadb147fb3d74e12f89ea28808ffe42d
font_01_sfnt_off000082e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E8 11788 bytes
SHA-256: 38362e3603b70672654fcf0d8296297f5c25a1313a04a9935cdcadadafefa914

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