Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9f0f235741c342…

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 09:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c747ed5df262b8ea068f31441b249d79 SHA-1: 923721061ba0f2ec959ee99928bb2d276e2b2b2f SHA-256: 0d9f0f235741c342b1b4aa24811065122324a5b419b22d4318f78e81d3f44261
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one prominent link redirects to a malicious domain. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The document body, though heavily obfuscated, contains the URL that leads to 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.link/wix?keyword=factorio+achievements+with+mods
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/lofobaworelufowa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5442/2423/files/2907478193.pdf
    • https://cdn.shopify.com/s/files/1/0452/8783/3762/files/cambridge_igcse_computer_science_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/business_communication_process_and_product_5th_edition_free_download.pdf
    • https://static.usrfiles.com/ugd/b77b08_0bed51d0e3364ac4996815092e03b02c.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_6b8ade08ee9e4216a3140c5127182bbf.pdf
    • https://static.usrfiles.com/ugd/0bcf16_3ff426c972434abb9dc0c8545a1ce92c.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9423/files/alister_mcgrath.pdf
    • https://cdn.shopify.com/s/files/1/0436/7892/4953/files/app_to_download_free_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/2324/4191/files/63776674113.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/zakekigi.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_off00006b7e.bin
25eb3d1cde51a0994fdeffd3885889354f84324105b71b5cb06841991a00c982
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7E 5252 bytes
font_01_sfnt_off00007d45.bin
2b0d1d0366c4d2d23de8dab92d6f869dd9f6aa270fda5a7835048bddc6da7039
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D45 10360 bytes