Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77721aebcd58d82…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 19:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9bede2969be8d413f40fd1009477eb6 SHA-1: ec1d513e08ad0ddff01287ef65f0cb85aaf37bfb SHA-256: a77721aebcd58d8286738df7756c21cf7b85953dfd93b32ebe1e87f44962c771
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'computer basics worksheet'. This link, `https://ttraff.com/wb?keyword=computer%20basics%20worksheet%20section%2010`, is designed to lead users to malicious infrastructure. The document also contains a large number of embedded links, many pointing to `cdn.shopify.com`, which is indicative of a link farm used for SEO poisoning or to obscure the true destination. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/wb?keyword=computer%20basics%20worksheet%20section%2010
    • http://kokikona.wilesbolt.com/uploads/1/3/1/4/131454012/430860.pdf
    • http://files.chandascreations.com/uploads/1/3/1/4/131452878/mabiwan.pdf
    • http://files.lash-lab.com/uploads/1/3/0/9/130969984/dozobefokevo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/construction_submittal_form_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/vajavameba.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6330/files/ruvipevemupufi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/9476975315.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/nibeguzonuwawosogivivi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/what_happens_at_an_engagement_party.pdf
    • https://cdn.shopify.com/s/files/1/0450/6232/4376/files/gentle_chair_yoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/30454047675.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6564/files/jefoguvowogop.pdf
    • https://cdn.shopify.com/s/files/1/0437/6789/0069/files/grade_10_english_fal_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.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/
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000650b.bin
b020643481ae2f4865c0e0f8d498a6f9da14819868fd023fa5f06bb815fd92bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650B 5536 bytes
font_01_sfnt_off000077c8.bin
14866c904f64c40d53720214fc06dfede148f6d2fe2cc3cf893349dbf21192f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C8 10380 bytes

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