Malicious PDF — malware analysis report

Static analysis result for SHA-256 07764e8c6df2c9b1…

MALICIOUS

PDF

40.5 KB Created: 2020-08-23 18:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54224702c5aa9a62e7906f3f28c5ebf0 SHA-1: 75901f93cd5186ae197f53582e9f8a6d3105b9d9 SHA-256: 07764e8c6df2c9b1b0dfbf93d4804881670235d74e93228a2f5e4c14254eaa23
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to election ballots. The presence of multiple external PDF links, some benign and some unknown, indicates a potential link farm or redirection strategy to obscure the ultimate malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=sample+election+ballot+template
    • http://files.flyingmissionusa.org/uploads/1/3/1/4/131438823/sazimafixegoludevon.pdf
    • http://files.alishamonique.com/uploads/1/3/0/7/130775561/digoxodiwifuvu.pdf
    • http://reziza.caitlincannonphotography.com/uploads/1/3/1/4/131411896/cfe1919ee970f0.pdf
    • http://files.thealicegallery.com/uploads/1/3/0/7/130775675/2640ced7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/19759224744.pdf
    • https://cdn.shopify.com/s/files/1/0438/5406/9910/files/british_council_ielts_reading.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5957/files/zerazokuven.pdf
    • https://cdn.shopify.com/s/files/1/0430/0193/8079/files/everest_base_camp_packing_list.pdf
    • https://cdn.shopify.com/s/files/1/0440/6870/0310/files/loxewoberewolisixojomi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/basic_grammar_test_for_beginners_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0944/files/26555572326.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/61914302482.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_off000062cc.bin
5833782a57c00fc192134718c085a4007e5677e69ab4d4c3844caeb95c1f6320
pdf-font-stream PDF embedded font (sfnt) at offset 0x62CC 5048 bytes
font_01_sfnt_off000073de.bin
bae6172031412156e680fade868e55b8fa63e35f2e39f22410dd88d11ee23b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x73DE 9872 bytes