Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2902fb56fcb3b04…

MALICIOUS

PDF

53.9 KB Created: 2020-10-26 02:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13fcb7ad69563b6960a5fa6ed41f5a16 SHA-1: 9ed3916872b0e4c0164a0612e70f90ab80021fa9 SHA-256: f2902fb56fcb3b04970acf13700ff3666787fbbbea1e71c04d93b95612cf7c96
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic academic resources, with a primary malicious redirector URL. The ML classifier strongly indicates malicious intent. The document body, though heavily obfuscated, contains the malicious URL and several other Shopify links, suggesting a phishing or scam attempt to drive traffic to malicious infrastructure.

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=jurisprudence+notes+llb+pdf
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f888c0d36d8d.pdf
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f8cb0c796692.pdf
    • https://cdn-cms.f-static.net/uploads/4394071/normal_5f9252e1afd57.pdf
    • https://cdn-cms.f-static.net/uploads/4405440/normal_5f925af4a7c1a.pdf
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5f9605150619f.pdf
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5f8f487ae13bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0496/5741/3795/files/vumudufipufagikizov.pdf
    • https://cdn.shopify.com/s/files/1/0502/6873/3634/files/caustic_3_key_apk.pdf
    • https://cdn.shopify.com/s/files/1/0467/8038/3385/files/aviansies_slayer_guide_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0431/3415/6967/files/pebimoxikoxovuseb.pdf
    • https://cdn.shopify.com/s/files/1/0501/5679/8117/files/63269695466.pdf
    • https://cdn.shopify.com/s/files/1/0497/4300/3807/files/58028621413.pdf
    • https://cdn.shopify.com/s/files/1/0498/8675/7018/files/international_thespian_festival_2020_california.pdf
    • https://s3.amazonaws.com/pazifetanegapu/assignment_method_of_teaching.pdf
    • https://s3.amazonaws.com/sugaguxagu/descargar_libro_caballo_de_troya_3_gratis.pdf
    • https://s3.amazonaws.com/wonoti/thyristor_applications.pdf
    • https://s3.amazonaws.com/lumixi/88879928769.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/aprilaire_213_replacement_filter_amazon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1346/files/download_boxing_star_mod_apk_android_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5208/files/single_phase_and_polyphase_circuits.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007499.bin
ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7499 2960 bytes
font_01_sfnt_off00007f1c.bin
b17cbc6a4ed47cce27555382a6a108899380bcaa914e6d5e5f46dc7ca67e111b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1C 5068 bytes
font_02_sfnt_off00009063.bin
786a9269d41041a4f5cbbfa8d87d98f616e11b69241340b9b1b3b9cdb5b5776e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9063 10516 bytes
font_03_sfnt_off0000b4a0.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A0 16036 bytes

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