Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7d4ce06d304550…

MALICIOUS

PDF

52.1 KB Created: 2020-07-28 14:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f062872a90f4cb2d4ab1ff21d07f9cc3 SHA-1: ee6c1349493721b67e63ea3b490cbbf77a12ff61 SHA-256: 6a7d4ce06d3045503db186e788457a52853e1e687211693be7bfd07247aea313
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with the primary link directing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were directly extracted, the nature of the links and the ML classifier's high confidence point towards a malicious intent, likely related to 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=belmont+report+justice+prisoners
    • http://files.directaimmedia.com/uploads/1/3/1/6/131636914/xogebewiwatudir.pdf
    • http://files.brurosa.com/uploads/1/3/0/8/130813362/gitakulotenip.pdf
    • http://files.mindyleanse.com/uploads/1/3/0/8/130813409/fasifukowumove_kagarinaxaxeku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xatet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50036278562.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/lonexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53978683100.pdf
    • https://cdn.shopify.com/s/files/1/0429/9027/2675/files/86863618866.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5523/files/roresolegola.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/49233491352.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/zagub.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3110/files/zaderipiwu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2470/9782/files/zosumomirewipixizifufe.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/pujobemavopisuwuduziw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0412/files/83061397614.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_off000090df.bin
27b51516fc55f8ee112650db628c9d6e6b8ea250c00e2b705f9094072aea3685
pdf-font-stream PDF embedded font (sfnt) at offset 0x90DF 4876 bytes
font_01_sfnt_off0000a15c.bin
311c11bcefb8e62ca58fe1d1a39ec871b8bcac1d9fab0f1e40cc4e213ca4c8a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xA15C 9828 bytes