Malicious PDF — malware analysis report

Static analysis result for SHA-256 5515476e9b8d71a6…

MALICIOUS

PDF

39.9 KB Created: 2020-08-26 02:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6bbf534657c0929527795ac571658a SHA-1: d6fa6a18244244e517cd90ef0bc8e81baed72e4a SHA-256: 5515476e9b8d71a683e6becc013c03989df9ad533a25085a462fc941caedae4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to reading passages and a URL that appears to be part of a link farm, suggesting a lure to potentially malicious content or SEO manipulation.

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.com/pify?keyword=main+idea+reading+passages+third+gra
    • http://files.familytreemandvbaker.com/uploads/1/3/0/7/130775286/9364227.pdf
    • http://fukogufe.ayurvedaora.com/uploads/1/3/0/7/130740221/vubofezefugedil-kumoronunotejif-nugun.pdf
    • https://cdn.shopify.com/s/files/1/0429/2460/5599/files/13963929348.pdf
    • https://cdn.shopify.com/s/files/1/0434/8723/2166/files/diagnosing_depression.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wudogezemolajefenupil.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/business_card_template_illustrator_file.pdf
    • https://cdn.shopify.com/s/files/1/0437/7496/7965/files/macroeconomia_argentina_miguel_braun.pdf
    • https://cdn.shopify.com/s/files/1/0439/0407/3880/files/76470120820.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/63027101878.pdf
    • https://cdn.shopify.com/s/files/1/0437/6018/9594/files/xaxenosokutokosipijugasok.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6607/files/asynchronous_and_synchronous_motors.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/a_wrinkle_in_time_chapter_9.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f89.bin
4fcdb1df7477a5f7ab90a5102101d6287f77ad57a39849a85b531857e115ac28
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F89 5192 bytes
font_01_sfnt_off0000712a.bin
b6a9665e404b69dff5e1876444a9154dfa3875814ec44a4f1f5b3b1b20cff507
pdf-font-stream PDF embedded font (sfnt) at offset 0x712A 10020 bytes