Malicious PDF — malware analysis report

Static analysis result for SHA-256 db683301bf9eab05…

MALICIOUS

PDF

120.7 KB Created: 2020-11-07 20:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f4245fe06884c6172dc833e85d561ec8 SHA-1: 6a724d6c5554637bf37c6bba6e144958855b3644 SHA-256: db683301bf9eab05e5b686f216630c162514614bb7991ff387fcec0f406eaed1
152 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.7782

Heuristics 3

  • 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.
  • 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/wb?keyword=ryuusei%20no%20howl In PDF document text
    • https://baxinumep.weebly.com/uploads/1/3/4/3/134366260/f2321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f8809c340ffe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tozanibarave.files.wordpress.com/2020/11/37847695558.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/85624094514.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/fapinaxifasowovinivu.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/the_knitting_answer_book.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/calendario_laboral_2019_las_palmas_de_gran_canaria.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/8754536899.pdfIn PDF document text
    • https://zipexazoti.files.wordpress.com/2020/11/vekomozewegebanerilim.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00007154.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7154 110804 bytes
SHA-256: 685db80ec979b528e32b695b6935aea452c3ad650d12571c6d5652ebea302459
font_01_sfnt_off0001b9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9BD 4468 bytes
SHA-256: e5a7247d5169ef4b5a33bad2e237cea797c90114328e9df9a42cd4afdf2e7c68

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