Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa3597acde31afe…

MALICIOUS

PDF

47.1 KB Created: 2020-08-21 20:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 520254ce49ebc8768ca81e0d733c522c SHA-1: b9f49009d52244ae9d1ec63b1751f1e33fd4c851 SHA-256: 5fa3597acde31afe53b16f48e269fd37e7a8c03af1d39f5d7f334dcf30cda067
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise its true nature. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to lead the user to a phishing or malware distribution site.

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=migratory+beekeeping+ielts+mentor+answers
    • http://files.niwawriters.com/uploads/1/3/0/7/130740316/lewuwajuwe.pdf
    • http://files.tubmannaturecenter.org/uploads/1/3/1/3/131398117/molam_rosob_fapisijul_wobul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/83537836258.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/nopigofewomixilozoxerujer.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4560/files/joreluxezuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0941/files/find_accident_report_florida.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/raxepube.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/day_of_the_dead_skull_coloring_page.pdf
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/certificato_anamnestico_medico_curante.pdf
    • https://cdn.shopify.com/s/files/1/0430/3595/1257/files/21178035131.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_off00007205.bin
03a8bbca1ac29eb50e8bf81d0dc7d293bf9d9b42630c2de78302b7f6025da0c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7205 5540 bytes
font_01_sfnt_off000084f3.bin
f981ea7d45090c4a22da53c0e9473952f94ccb58e1b98a0632e7879b9dd29875
pdf-font-stream PDF embedded font (sfnt) at offset 0x84F3 13548 bytes