Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5cd1eb3d4ad90d…

MALICIOUS

PDF

36.2 KB Created: 2020-10-26 17:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6c13cc32b2f48b9c95aef04f04ef4667 SHA-1: e323a0333def117711b0c2211b3b4627f08af952 SHA-256: dc5cd1eb3d4ad90d501a9b3073472a17e7ed494fec0fbfa09c437ea787ccdae5
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-hosted files, suggesting a link farm for SEO manipulation or malware distribution. One prominent URL, 'https://ggtraff.ru/aws?keyword=econometrics+by+example+pdf+free+download', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains similar URLs, reinforcing the malicious intent to redirect users to potentially harmful content under the guise of a free download.

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://ggtraff.ru/aws?keyword=econometrics+by+example+pdf+free+download In PDF document text
    • https://noxurujoba.weebly.com/uploads/1/3/4/3/134384046/nobokilewowupax.pdfIn PDF document text
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/845a7565df908e8.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/vakukil-sinidebazedu-burewevito-milumaxemomazu.pdfIn PDF document text
    • https://sumijiluwovoj.weebly.com/uploads/1/3/4/2/134266387/3b919.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/9015792.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/zamiv_tixomutudorasuv.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/ranipefule.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/9419916.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/454c3812bf78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f8d5f5421ec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5f9150a933dd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f891759a2854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f870158ef3ac.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/felasorarabipis/bivamofovazaxid.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/books_and_authors_2018_download_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/sperm_analysis_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/socomec_atys_c30.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/brochure_hyundai_kona.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/valeur_ajoute_dfinition.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_off00004e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E99 5660 bytes
SHA-256: 6100ff29d9030c62390e971a7662427bdce020e3537928fb22f44348d7b26827
font_01_sfnt_off000061cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CC 9924 bytes
SHA-256: bdd79e5ce3cc12e191c5ddbb6742f25c1a5ae0edafbbc3f038bb8d847616f118

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