Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e5ca33afc45e6e…

MALICIOUS

PDF

43.3 KB Created: 2020-09-04 04:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1b28da03ea99b04040abd69e1d24757 SHA-1: 8a364c0d9a5468886fc8f59744e0d3dff149f38f SHA-256: 11e5ca33afc45e6ebc5f1799d3ac3d32590c0cc4d0d0483047133778f0edcecd
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a seemingly innocuous keyword related to pub quizzes. The document body, though heavily obfuscated, contains the same URL and references to pub quiz questions. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the redirector link is a strong indicator 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/wix?keyword=musical+theatre+pub+quiz+questions+and+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/amending_the_constitution_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/girawi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/acrylic_plastic_sheet_thickness.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/sbi_atm_debit_card_application_form_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/sikavunometumozun.pdf
    • https://cdn.shopify.com/s/files/1/0440/1260/1502/files/41865142218.pdf
    • https://static.usrfiles.com/ugd/7d21c0_bdc41afdd39d45ccbf98ffe0562e9b52.pdf
    • https://static.usrfiles.com/ugd/41a0b6_71cf9488c8fa41009fe2512dd811c030.pdf
    • https://static.usrfiles.com/ugd/d3758e_3480df07627245f7a463d1dde447b49d.pdf
    • https://static.usrfiles.com/ugd/ce14f3_15be12a5f09841f38a2a3610bead8d27.pdf
    • https://static.usrfiles.com/ugd/a86d68_e37ec50189194718a5679bf4a7519dff.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdacf10884604719b5fe5f97e6c3203c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b38903ac0944aadbc3783f42a6e28be.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a7f.bin
9161c436467b79aefad4e25e7cddb5310783a0d436f6cb9cc93af1217f451836
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7F 5576 bytes
font_01_sfnt_off00007d84.bin
9f8b0d9b63708672cc5ca1c8c8b3406f9f609e3b8238ac3774747b3cb717498f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D84 10296 bytes