Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdd7e3662a86cf7…

MALICIOUS

PDF

43.7 KB Created: 2020-08-19 00:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aa099690e2502f037cee1f39f1f8078 SHA-1: e874108baf18b25e298a3574a225ecfd2087b84e SHA-256: 6cdd7e3662a86cf78e627de1729bcb64d5cba5b2df3c4c6f8d0707ffef2303c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains text that appears to be a lure for 'Gerd treatment guidelines pdf'. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt 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.com/pify?keyword=gerd+treatment+guidelines+pdf
    • http://sunalap.banyan-consulting.com/uploads/1/3/2/6/132683071/ravegapuxow.pdf
    • http://files.tangonegrofilm.com/uploads/1/3/0/7/130738875/rolubotax-ratatedur-jebiberolusov.pdf
    • http://fugixoxir.saltwaterandseaglass.com/uploads/1/3/0/9/130969723/78ca46e775c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/kinobody_superhero_bulking_program_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2462/1473/files/73534003202.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/10182853189.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/zakunezaw.pdf
    • https://cdn.shopify.com/s/files/1/0459/9011/7538/files/wumatoza.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/44008315294.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdf
    • https://cdn.shopify.com/s/files/1/0437/0356/6486/files/51957036521.pdf
    • https://cdn.shopify.com/s/files/1/0451/6613/3397/files/administrative_assistant_resume.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000615e.bin
0b532badee7a3fc060f3bf1db2b4f910bfa2c7b5307a61c70f1335785ae99b80
pdf-font-stream PDF embedded font (sfnt) at offset 0x615E 5164 bytes
font_01_sfnt_off000072d8.bin
b3ef020c69fe294ea8358c6f9ef81f65f97120a8aa9f1213114db16760b35e71
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D8 9816 bytes
font_02_sfnt_off0000945e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x945E 4324 bytes