Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc02bfe07aae487…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 16:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9794b3857f30fe0af514c040b7507a9 SHA-1: d8d74f9f9cd4d93c2392ceac7c41a21b402394c6 SHA-256: 6fc02bfe07aae487a44b9415cd195f481342a72855d624b46b0d3676d8b25df3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as an EFTPS payment worksheet. The document also hosts a large number of links to PDFs on Shopify, likely as part of a link farm to improve SEO for malicious content. The ML classifier strongly indicates maliciousness.

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/wix?keyword=eftps+payment+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/zikufaluxoxonunubupab.pdf
    • https://cdn.shopify.com/s/files/1/0444/7030/4935/files/git_undo_local_changes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/ceiling_fan_e206035.pdf
    • https://cdn.shopify.com/s/files/1/0440/7109/2376/files/black_armory_bow.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/david_snyder_nlp.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19441108854.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/inorganic_chemistry_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/ancient_greece_and_rome_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/sample_email_template_for_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/guxevajasorilazozafexed.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/bmw_x1_2010_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/wefesowuwumo.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_off000061f7.bin
61a2cbe141244e046b9ac46a9e5271e3fb7e37629809a7b4bf7da489ed0fc614
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F7 5324 bytes
font_01_sfnt_off00007402.bin
d0ba85e31ced519dc961f186acb2c7e066c8377ee8b3956750fbcbae046b66b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7402 10628 bytes