Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7be6377e535c14…

MALICIOUS

PDF

37.3 KB Created: 2020-08-18 13:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f773d5703f6da10fa24895ce3c12e755 SHA-1: 09d5b4f08d547ee3eeecefafb1b20c33eb5d4142 SHA-256: 5a7be6377e535c143ccda45c9fe8a5254a6b3af66e83daa8c24ce8085d655e3e
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 resources disguised as PDF files. One of these links, 'https://ttraff.cc/pify?keyword=freezer+paper+sheets+uk', is identified as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, 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=freezer+paper+sheets+uk
    • http://pomujabiz.chicagoyouthshakespeare.org/uploads/1/3/2/6/132683001/laxizevuwiweguj.pdf
    • http://vekibofon.unad.agency/uploads/1/3/0/7/130775850/sufovebiw.pdf
    • http://files.in2improv.org/uploads/1/3/0/9/130969910/kojuwodela.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/4546823151.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53981477141.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/ruruj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/32064472559.pdf
    • https://cdn.shopify.com/s/files/1/0437/5298/0641/files/xamika.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/81086136090.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/wuwolukim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4347/files/46317931049.pdf
    • https://cdn.shopify.com/s/files/1/0446/0707/8564/files/menadifotidobujubelutawo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/mla_cite_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/cbse_class_10_syllabus_2020_19.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_off000054bc.bin
b45cc038c56cc2c30e5639eb4aa6d7e945387e9d5914dd602a5a078adb6c76a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x54BC 4944 bytes
font_01_sfnt_off0000658b.bin
bf911735b79ad5f3e56bf257d6716f157a91b58ebf72361557ba388e164aecc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 10700 bytes