Malicious PDF — malware analysis report

Static analysis result for SHA-256 2142bf7dd00925c7…

MALICIOUS

PDF

39.0 KB Created: 2020-08-21 08:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c36433ae7ed25bd87bce577323536c4d SHA-1: e39f627b07f64dc49bdb98ea1cf4c5311c14bdbf SHA-256: 2142bf7dd00925c79e4429c16694d1e02a6b9f755bb8d9763527ec30e766ade5
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains references to 'mathworksheets4kids' and a URL that appears to be part of a SEO spam campaign. The presence of many PDF links suggests an attempt to drive traffic to potentially malicious or ad-filled sites.

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=mathworksheets4kids+equation+of+a+line+answer+key In PDF document text
    • http://gatuzofak.burghyart.com/uploads/1/3/2/6/132681947/747645.pdfIn PDF document text
    • http://files.ridgewaygardendesign.co.uk/uploads/1/3/2/6/132681812/5216403.pdfIn PDF document text
    • http://files.popponessetbeachassociation.com/uploads/1/3/2/3/132303407/funedojuf.pdfIn PDF document text
    • http://kunug.feliciawu.us/uploads/1/3/1/4/131407469/49b6ec71e398e30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3859/6511/files/1376095219.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/23942629853.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/3560/3623/files/11741481439.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/pdf_butterfly_coloring_pages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2684/0738/files/ffmpeg_command_line_options.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6052/7265/files/swell_info_jax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/c._difficile_treatment_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/capoeira_fighter_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/fitil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/gelaguvab.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA0 5472 bytes
SHA-256: 96e3db32caf922ee95f2271cec166d9974a97b36ebc7a5485e43b9c62be28a39
font_01_sfnt_off00006e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5A 9484 bytes
SHA-256: 057d33f9c58b17e0bb3c1a1825b6a4706772cb9bdf6f0dee786e504397190823

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