Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f04c103e9590cb…

MALICIOUS

PDF

37.8 KB Created: 2020-08-10 00:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b99a2036079c964dd6e375581632cd4 SHA-1: 665fa58bb6400d63e2daa3f66b67c5025600edb3 SHA-256: c4f04c103e9590cb1063b064dec2e064b520ced77290a097000e511f3b65e1a5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous embedded links, including one pointing to a known malicious redirector at `https://ttraff.com/pify?keyword=possessive+adjectives+exercises+worksheets+pdf`. The document body, though partially corrupted, also contains this URL, suggesting a lure to trick users into visiting potentially harmful sites. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to manipulate search engine results or distribute further malicious content.

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.com/pify?keyword=possessive+adjectives+exercises+worksheets+pdf
    • http://files.mylittlebiblestudy.com/uploads/1/3/0/7/130775619/3c60c1.pdf
    • http://files.sscoinworks.com/uploads/1/3/0/7/130776590/ribowejelexux.pdf
    • http://dinega.takemyhandcaitlin.com/uploads/1/3/1/4/131438437/9844627.pdf
    • http://files.how-we-travel.org/uploads/1/3/2/7/132741169/nikojufegu-walekuwigesaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/15261137726.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7650/files/rakalebivavez.pdf
    • https://cdn.shopify.com/s/files/1/0435/0361/6165/files/19536113989.pdf
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/refractive_index_of_oil.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6285/files/81473278097.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/tixazizikaxel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3126/files/matlab_plot_log_scale.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/59535660684.pdf
    • https://cdn.shopify.com/s/files/1/0439/5089/9368/files/hipertrofia_de_adenoides_en_nios.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_off0000561b.bin
7a2c7db83d97c7b8ffe9f6f857b5751409e09dd60ec8e0c7e599746c33ccda57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x561B 5572 bytes
font_01_sfnt_off0000692b.bin
9b43128b8e060dab7c5022a9801e43b2b17c60943dd8dc7e2a4f0d3069662380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692B 9692 bytes

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