Malicious PDF — malware analysis report

Static analysis result for SHA-256 7753896446f77d9c…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 18:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f85e70727ccd86d3281d585a8ac5190d SHA-1: 76dff9f21f479939eef204744950f438f9099a4e SHA-256: 7753896446f77d9c30d56043dd0fc13d231c441241e2578f6d75d62598b6a370
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though obfuscated, contains the URL https://ttraff.cc/wix?keyword=oxford+3000+key+words+pdf, which is the primary indicator of malicious intent. The presence of numerous other PDF links suggests a tactic to distribute malicious content or engage in SEO manipulation for malicious purposes.

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.cc/wix?keyword=oxford+3000+key+words+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0434/9932/3558/files/20058770413.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/box_sizing_border_box.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96280370261.pdf
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/lojuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/botani_tanaman_asoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1532/files/tosuvanumonosutugusemom.pdf
    • https://cdn.shopify.com/s/files/1/0444/7944/7207/files/26820024438.pdf
    • https://static.usrfiles.com/ugd/b98abb_4a710b4ed01f48e29726bed665ccaf8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_84e7eea281714fa3a1c0a06a05a3401c.pdf
    • https://static.usrfiles.com/ugd/6f53d7_74f493059acf494886d531f1ee3d6549.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005809.bin
7e60f42aeafa444edcabb1dc48d60c178ace1d523f466f9d75b40c849527540a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5809 5452 bytes
font_01_sfnt_off00006ac5.bin
2c989e3d0bbcbec3cccbed9847a6ab76df9798744ea9ffd2b0c9f4b5508c1616
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC5 6144 bytes
font_02_sfnt_off00007aa5.bin
c42c1badf804f5f9fa9144b28a5d2ed26b880a7ca1dce076517d52033f17a4d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA5 9924 bytes