Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0245761eed70b86…

MALICIOUS

PDF

36.4 KB Created: 2020-10-02 16:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ab96c1803050af50263c1f6568fbbeb SHA-1: 5c9bdf31b74c138a7501e3658cf8b90d654fc538 SHA-256: c0245761eed70b86d27f8b87b3e1dd6658f7fc7ae816aa46e81611c495585e2f
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on strikinglycdn.com. One of the primary links directs users to a known malicious redirector at cctraff.ru, which is likely used to deliver a secondary payload. The document body and embedded links suggest a lure to trick users into downloading potentially malicious applications or 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://cctraff.ru/strik?keyword=medicine+dictionary+app+apk In PDF document text
    • https://site-1037856.mozfiles.com/files/1037856/nezarowunivemesevet.pdfIn PDF document text
    • https://site-1038750.mozfiles.com/files/1038750/kosawapurero.pdfIn PDF document text
    • https://site-1037180.mozfiles.com/files/1037180/debubavenonesofubabu.pdfIn PDF document text
    • http://files.houstonbottledwater.com/uploads/1/3/0/9/130968950/pawipimig-vegiv-sukok-selalix.pdfIn PDF document text
    • http://regexek.nauigreendiver.org/uploads/1/3/2/7/132740351/xemamati.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/2e011001-c5bc-46e3-b65d-8f29ecc32dd2/nifatikelukufubibubevenup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be05f63-53b7-4781-9938-92a135f104a6/66455026913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b5d0149-e511-4ad4-9f93-5b96e708c076/rejetasovoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0457be-953c-4589-ad88-8e87ef7f5981/modolusegimod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5597d3a8-902f-48cb-bcf4-21f2d8d1846b/gozimudijimiwavilosofix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1452/6872/files/leisure_world_post_office_silver_spring_md.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1192/6948/files/eat_read_love_sal_biadora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9518/6851/files/95763348977.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3064/9749/files/zovulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8673/1681/files/2736152781.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_off000051db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51DB 5028 bytes
SHA-256: c4fe552e3dc70c9235ef4fd30a9a99db6fa9f7ec0e146950a7997378ea2f1d39
font_01_sfnt_off0000631c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631C 9912 bytes
SHA-256: 9b3e9063026c8d0f3c30b9f27cff07023209171cb8be8611869f3be881af04dc

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