Malicious PDF — malware analysis report

Static analysis result for SHA-256 19779186ea6ad7ed…

MALICIOUS

PDF

32.2 KB Created: 2020-08-12 17:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 481aa1f6e56afb0baa53eae0fa0b70cd SHA-1: 33b65445443e0306c28673b4b3f8f7856162e4b9 SHA-256: 19779186ea6ad7ed9b0519eaca7f9615ce9f30db3ba10bd46c6d1760f051ad03
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to potentially malicious redirectors and link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://ttraff.com/pify?keyword=chain+rule+with+trig+worksheet+pdf, which is likely used to direct users to further malicious content. The document body, though heavily obfuscated, contains references to academic worksheets and URLs, suggesting a lure to trick users into visiting these 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.com/pify?keyword=chain+rule+with+trig+worksheet+pdf
    • http://wumuteg.clearlyjoewhite.com/uploads/1/3/2/8/132816066/8604089.pdf
    • http://files.lukascrafts-innosense.com/uploads/1/3/2/6/132696029/pawunugixigamiriku.pdf
    • http://files.detailsstrategicadvisors.com/uploads/1/3/0/7/130776682/gawunexix.pdf
    • http://files.faustina2.com/uploads/1/3/0/7/130775741/8353447.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/17018239435.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/30976657094.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1758/files/rafudoxadupozef.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/69691851519.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/95666960933.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54341666742.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fasexerogetotano.pdf
    • https://cdn.shopify.com/s/files/1/0432/1021/1491/files/math_logic_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/seven_chakras_in_human_body.pdf
    • https://cdn.shopify.com/s/files/1/0435/9425/2456/files/9533650287.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_off0000420c.bin
a5dec412eef93fc90e3935d9d79c898ddf8cb374b5c992f29149573c2e5eb679
pdf-font-stream PDF embedded font (sfnt) at offset 0x420C 5364 bytes
font_01_sfnt_off00005455.bin
9094855a21cddd0f25db87c92c3a89e644c2bcd07c8ba7ad32e47fc0649cb23f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5455 9340 bytes