Malicious PDF — malware analysis report

Static analysis result for SHA-256 57543c204b684b9f…

MALICIOUS

PDF

57.4 KB Created: 2020-08-19 12:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20465c39537d754bd996b5b9d8666704 SHA-1: d520f155e7213096e539fbaef28c25da00e7ee68 SHA-256: 57543c204b684b9fd841d61b03bdaae23a117ed9cbcfd6453f43ceeae635e71f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many pointing to Shopify domains, suggesting an attempt at SEO manipulation or a link farm. One critical heuristic indicates a malicious redirector link to 'ttraff.cc'. The document body, though partially corrupted, contains text related to 'Guru99 manual testing interview questions and answers' and mentions 'wkhtmltopdf', indicating a potential lure to disguise malicious content. The ML classifier strongly flagged this PDF as malicious.

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=guru99+manual+testing+interview+questions+and+answers
    • http://files.prigitalsolutions.com/uploads/1/3/1/0/131071076/577897.pdf
    • http://files.briorecordings.com/uploads/1/3/0/8/130813458/fokeg-xemaketono-dufejilamu-fatuke.pdf
    • http://files.jasminanedanovski.com/uploads/1/3/1/6/131636903/8845307.pdf
    • http://files.talleir.com/uploads/1/3/2/6/132681359/4102424.pdf
    • http://files.nickconbere.com/uploads/1/3/0/7/130739601/1691759.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/phonetics_and_phonology_notes.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/bodaxokuleziminalelidu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/18952900658.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3763/files/50938868968.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/69780571590.pdf
    • https://cdn.shopify.com/s/files/1/0432/2911/8627/files/nedukoweger.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/5095552589.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/research_methodology_in_applied_linguistics.pdf
    • https://cdn.shopify.com/s/files/1/0433/9571/1132/files/ib_binomial_expansion_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/4419/8805/files/49585433362.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/az_100_dumps.pdf
    • https://cdn.shopify.com/s/files/1/0433/4478/9653/files/jogijeko.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a1e4.bin
10185af34c983fe88c08aa0343e644f0564b75561674d8d1c21fdc4dec4e87bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1E4 5608 bytes
font_01_sfnt_off0000b4ee.bin
369e1b23da874ce2684242ad2ac17aaf4dafde131681e990c7f6887a97c8ba98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EE 10296 bytes

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