Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ba2f1a0e8c2729…

MALICIOUS

PDF

37.7 KB Created: 2020-08-17 17:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2301e431f0e5f836ddb9ce5ffe7b562e SHA-1: d99c167d383f0d6ced08aaca2dfebfffec1f5f14 SHA-256: 36ba2f1a0e8c27296611650e987aa909e3d26783bd0f952945b035103b648471
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'worksheet' and includes the malicious redirector URL. This indicates a likely phishing or malware distribution attempt using a lure of educational 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.cc/pify?keyword=clothes+worksheet+first+grade
    • http://files.suewheelerintuitiveconsulting.com/uploads/1/3/1/3/131398334/dupowa.pdf
    • http://files.selbylibraryfriends.org/uploads/1/3/1/6/131606563/9e53b1d.pdf
    • http://files.melissayvonnephotography.com/uploads/1/3/0/7/130775033/weninu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/pdf_to_word_online2pdf.pdf
    • https://cdn.shopify.com/s/files/1/0427/7331/5740/files/9013505562.pdf
    • https://cdn.shopify.com/s/files/1/0435/4234/7927/files/58404198901.pdf
    • https://cdn.shopify.com/s/files/1/0440/8115/2152/files/xikamuledasopisej.pdf
    • https://cdn.shopify.com/s/files/1/0433/7909/7758/files/16389274296.pdf
    • https://cdn.shopify.com/s/files/1/0437/9551/3505/files/33305090103.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/micro_infinity_to_rf.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/zujixabug.pdf
    • https://cdn.shopify.com/s/files/1/0439/2511/0952/files/prenup_agreement_template_uk.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_off0000556c.bin
796e4d1dc901b44cb9ad3cf955a3905d7d8b758bad735d1c1ae6880972666575
pdf-font-stream PDF embedded font (sfnt) at offset 0x556C 5228 bytes
font_01_sfnt_off00006741.bin
89309968c148011ba92972c2c69ddca45c4dc6834fa1d16b55db02d61c63b7a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6741 10412 bytes