Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9823d0e0950dc3a…

MALICIOUS

PDF

41.2 KB Created: 2020-10-30 12:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a1b89a94a4cc54471d80be3acada9bd2 SHA-1: 9f66305c4faa8340a3a3bf3b1116d02a0a70ce05 SHA-256: c9823d0e0950dc3a000837ab2f33a82e094ee5f4058d337ac494bccfab4d0cf7
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 of which point to benign-looking documents, but one critical link redirects to a known malicious infrastructure. This suggests a link farm or SEO poisoning tactic designed to lure victims to a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of malicious intent.

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://ttraff.link/123?keyword=how+many+protons+does+calcium+ion+have In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5f999f4bbd348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_5f89abdc032eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f91c4c8e4b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_5f963c53b74a5.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/fodose/barnes_and_noble_career_hackensack.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/plastic_training_pants_6t.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/cholesterol_lowering_foods.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/fopabufetodexudizepo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7333/4167/files/decision_makers_guide_dla_child.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/adfly_press_allow_to_continue.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8023/5193/files/manual_conversor_digital_isdb_t_terrestrial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cdfdb89-8113-444b-b5ff-94bba8850043/72851332241.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/43530094412.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1141/3412/files/1031520592.pdfIn PDF document text
    • https://medlineplus.gov/calcium.htmlIn 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_off00006028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6028 5528 bytes
SHA-256: db5b8a9d8e2fab41aa08324c4620f8079c27a90f91446b6960352aa368a337ab
font_01_sfnt_off000072dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72DC 11012 bytes
SHA-256: c3d1421c47b58fa47d3890d480b27104173f6ca077f0941682a7d6738a086ae7

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