Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1c5df6bc740e70…

MALICIOUS

PDF

49.7 KB Created: 2020-10-31 23:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 665568d412bb26f687a0ca89f3328114 SHA-1: d6f165527fe2299481e99fc932d3d028ea35a7cc SHA-256: 5e1c5df6bc740e707428f43c0b9387dbb2388193b8424511ce82321d0efe73f1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=proform+spacesaver+500+elliptical+reviews In PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/2164756.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/mezevigazujul.pdfIn PDF document text
    • https://xawaviwuxuj.weebly.com/uploads/1/3/4/2/134235980/6913216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4086/5956/files/download_aplikasi_border_light_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/benim_hocam_matematik_ders_notlar_tyt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9216/3227/files/zobitupiwenoriseze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2251/5865/files/62312107375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8947/0643/files/chemistry_book_class_11_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4017/6793/files/best_free_android_music_organizer_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5286f3-9bca-4219-a858-e1d0030c4fae/93865001297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8998bfcc-991a-49ea-a625-2958e9a8837f/45203529901.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5385/6921/files/tiwazug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1526/4158/files/cheat_engine_apk_pc_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCF 5580 bytes
SHA-256: 23e71394e8a5694dca1b7f73bfe1c039b60eada7b645138e21399454042c7071
font_01_sfnt_off000072cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72CF 10868 bytes
SHA-256: 9a1fb41876aea35327739412942fb6f213952051e8e4175da44a29899d5428a7
font_02_sfnt_off000097fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97FD 20752 bytes
SHA-256: 383c020160a86ef50cc2b6d44c8c304cad6658ae63146c05d2d877dafbdd9077

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