Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a91edebd278ed2…

MALICIOUS

PDF

64.5 KB Created: 2020-10-30 18:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 04d544350f9c63ddea294e8c1a8fcae5 SHA-1: 5353fc1072792ea66bb741aa45cb7075e7dd9c49 SHA-256: 31a91edebd278ed2b1d62b137be07bd84130b2b5720fa504ce44cb66d4fab420
162 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ttraff.cc/123?keyword=showbox+samsung+tv+apk In PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/1863abf3.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/16bf1.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/2431298.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/1409081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5f98716142510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5f96414c80eab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f88f5286d036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f9a601d30322.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/tadovu/panduan_akuntansi_dasar.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/how_to_write_children_s_books.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/foguviwe.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/gulivugoduza.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/ecology_and_environment_ncert.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/79186730919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4001/7064/files/50266604279.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_off0000bd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2E 5632 bytes
SHA-256: b0cbef3b001485b41de54649bd9f9a033fe491c2d179bf4679bdd483bf651999
font_01_sfnt_off0000d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD045 10812 bytes
SHA-256: 209f2849fdec58b0eca84794631a7ec98cc3cacdee1b8ebdf9b5eaf691bddbf3

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