Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4e0b871b07e510…

MALICIOUS

PDF

44.6 KB Created: 2020-10-31 14:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 59de642bf8d58188003ecc51ba7b4867 SHA-1: 226ac27243b5dcacb532b62817b99c47eb65bcc3 SHA-256: 2c4e0b871b07e510f708b957903bc50bde6aa65edeef09214a9e573b7c6bb49b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Weebly and S3-hosted PDFs, which is indicative of a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the ultimate goal is to lead users to harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially compromised or malicious sites.

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/aws?keyword=spanish+words+with+s+in+it In PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/2f59c5b.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/3243788.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/8800606.pdfIn PDF document text
    • https://suvojenedixu.weebly.com/uploads/1/3/4/3/134354738/62152.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/21483d820175.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/af78492.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/loneminovu/watch_justice_league_online_free_dailymotion.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/45987893482.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/dunoxudipedivi.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/south_carolina_state_standards_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797a2c3d-9a06-43c2-bc0f-88311507cd18/brian_tracy_eat_that_frog.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/fatuwiw.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_off00007122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7122 5208 bytes
SHA-256: d3e8bcd63c1ef4ddb2b0aed3ccf6161650a953ff252e24b84815afce5c99a58a
font_01_sfnt_off000082e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E1 10348 bytes
SHA-256: fdb8972c9389993765cdb84f1f9683b71e70c47df31bfdcd86de3067d669c612

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