Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc8f33dba589077…

MALICIOUS

PDF

38.4 KB Created: 2020-08-23 09:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9f1c43fd242b63d135bbf87fdba4495 SHA-1: 449f6564bf9398141f2299d987b138559ce9cfab SHA-256: 5bc8f33dba5890770c40cb35919fa97446354488b38f8f2959ecd783a3f62374
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=kensington+park+elementary+school+uniforms', is identified as a malicious redirector. This suggests the document is part of a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution.

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/pify?keyword=kensington+park+elementary+school+uniforms
    • http://biramoguv.inspiredwellbeing.com.au/uploads/1/3/2/8/132815176/ce0479078769bc.pdf
    • http://mujepasu.nomadicivories.ca/uploads/1/3/0/8/130873995/fovewofuxiw_zatajexeg_bozexud_pokagezijexezow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/educating_all_students_exam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigirerunozekolufis.pdf
    • https://cdn.shopify.com/s/files/1/0439/8009/5646/files/jinagiwetipof.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/estrus_cycle_in_cats.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/jokivexebugipajesetuxir.pdf
    • https://cdn.shopify.com/s/files/1/0435/5581/5583/files/92908888411.pdf
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/satellite_tv_guide_europe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/79754342821.pdf
    • https://cdn.shopify.com/s/files/1/0434/4882/8065/files/tavuxabinol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.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_off0000538e.bin
89ba181e0901323c70bd249ca99d09de4820508db6e8424e810d6154d4bba1c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x538E 5564 bytes
font_01_sfnt_off00006659.bin
7fd6e604f6ed8c81b7cb594305c2aafad67a2c1553a7984044659388c29f1d23
pdf-font-stream PDF embedded font (sfnt) at offset 0x6659 11512 bytes