Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50db2ae0e21c1e8…

MALICIOUS

PDF

43.2 KB Created: 2020-10-30 00:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bb94dadbf571db43235ef27218df287b SHA-1: 0274fb66a122bbddd0cac88c88128e63c3d87167 SHA-256: f50db2ae0e21c1e8a780b0a79da7540d80b17d20d0fb52811b659a4a9e36e850
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to drive traffic to malicious sites. The primary malicious URL identified is https://cctraff.ru/strik?keyword=the+cell+cycle+coloring+worksheet+key, which is flagged as a redirector.

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=the+cell+cycle+coloring+worksheet+key In PDF document text
    • https://netaterosani.weebly.com/uploads/1/3/4/4/134438803/563c2769c88881b.pdfIn PDF document text
    • https://xobesatiwum.weebly.com/uploads/1/3/4/3/134359431/jejiwuge-fojepusirulufug.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/tuzixemaliv-sogatida-wajegabanu-neduvuruto.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/8452841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5f8ec0ad01dac.pdfIn PDF document text
    • https://gunapozebufe.weebly.com/uploads/1/3/4/3/134316646/539d0de4c75bc.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/4fbde12f-dc34-4ee1-af2f-7d94e8633a57/39895713239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284d2789-36e0-40b4-8c76-c63ca1d24b6c/76252534125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b74a4d-ef6b-43fe-adda-ee9d9fbb17f8/deluxe_dana_thomas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac02aec-fe67-4563-8bb1-dcc42e78019a/16967076425.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_off00006b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4C 5056 bytes
SHA-256: c1417e28c5d6a47be5927879556d79dc0c29c248e607143666fd2e7e18b2fd13
font_01_sfnt_off00007c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C98 10316 bytes
SHA-256: c5a3881ef64bdd5ce3b35bf22619156027e12a87f6490566222c4434a479ac5c

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