Malicious PDF — malware analysis report

Static analysis result for SHA-256 df10d7de956a9344…

MALICIOUS

PDF

36.6 KB Created: 2020-09-05 06:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 53f377e21e9d0c62b112e4d3a3d2f8ed SHA-1: fb58cbfea3407d4410d0d830547d042abe60d081 SHA-256: df10d7de956a934455c9231f428936f3d5977b65db6cbb3799f649e5855b28f7
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet, a common lure for phishing or malware delivery. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm tactic to obscure the malicious redirector.

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.club/wix?keyword=singular+and+plural+worksheet+for+grade+1 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/c0a468_fe18e325f698437987c27070e0b6e47d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7ff653_2e2ef7a353d9446bad362e44caf8fc27.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fb83f1_298656df247f46abbcdfc4cdabd33a8a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2715550b621f498fa91be0e05fa707c6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c7a620_46c3a94c3d5441dfa44f1200386fab23.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7766/4929/files/nifugokavubeven.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/59896754847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4344/5141/files/be_closer_apk_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3421/4561/files/dasodexilur.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a2e20a_b31edbf389b24bf290d4252c67defc3e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2f197_6d13e4e9afe74e8d9d5690aefdd956ad.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ea2c45_812b57f906574d20b1cf70ed36f49bac.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d2ea90ecca954ddb8538d840114365d5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2ddd39_0ff02ce1251e43b1a5b28a0669b47f24.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5666/0633/files/articles_of_association_and_memorandum_of_association.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/9231/2991/files/resume_templates_for_microsoft_word_with_photo.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_off000050e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50E0 5616 bytes
SHA-256: 6163486d2b181053fd94a1e226d617d578898ff262b1534b9fb8a74c5376dabe
font_01_sfnt_off0000640e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640E 9728 bytes
SHA-256: d753d533bdb16414e0c76a2d926dfd71be56090d0ff31e88a5066dff4b8e5f8c

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