Malicious PDF — malware analysis report

Static analysis result for SHA-256 857a31526275a1c8…

MALICIOUS

PDF

42.0 KB Created: 2020-11-01 08:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0a9c22ee4b7485f1d865ad41779a6357 SHA-1: 4b93d6784a6c449cb8046866e58881666c60cf44 SHA-256: 857a31526275a1c8dc0fe74cb0c4618fd1adcaa4bb5a2aba00dd9ff9c2f57461
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, with a critical heuristic identifying one as a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered this heuristic. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or SEO poisoning attempt to lure users to 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=the+aeneid+robert+fitzgerald+pdf In PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/xisonitupidez.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/mijedusovineti/the_autobiography_of_benjamin_franklin_dover_thrift_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7647/6828/files/malibobatit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8902/5942/files/lowercase_letter_b_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07bf3c8-49d3-4a26-872b-689a1b34f273/voxel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f64a7f-47cf-46b3-815c-58c52f3c6a24/exped_synmat_7_ul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0965/4440/files/biology_monohybrid_cross_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0884/2685/files/bipizelexirawilowofut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/ruvasizibexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658da560-1ecb-4664-9c98-58612d837ebb/75451029240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5774/9407/files/11418333762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86cc7839-fa87-4869-8e08-8bb6eb38e600/100_strokes_of_the_brush_before_bed.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_off000066a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A5 5264 bytes
SHA-256: 2327a9482aa7576556b681354196228a833a6c537ee2f1640bd8dfb611f3e087
font_01_sfnt_off00007891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7891 10136 bytes
SHA-256: ec34d7be874a139d922ee5e388d538ca86d5e4b73f335e20716239f2aa72c52e

Open this report in the interactive analyzer, or submit your own file for analysis.