Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c0a36d0e7b76ae…

MALICIOUS

PDF

42.7 KB Created: 2020-08-24 07:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee10ddd8ebc25083cd5ca739f9974dce SHA-1: 043eb8c295a4ca04cc6ad810e37dfb8f08eb95c9 SHA-256: e8c0a36d0e7b76aef2b30867dc7eeef3a55734d1f148092411ab0c74f5ecf938
152 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 redirects to a known malicious domain (ttraff.com). This indicates a link farm strategy designed to lure users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is the primary indicator of compromise.

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=asa+format+annotated+bibliography
    • http://xiduzal.afroverse.org/uploads/1/3/1/4/131438216/limen_wikavimekeko_wazujapazuvit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/xonekakafupovone.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/bumimeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/logical_reasoning_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0340/files/new_headway_beginner_student_s_book_with_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/1342/9655/files/cardiogenic_shock_pediatrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4010/files/jakawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/how_to_use_carstream_android_auto.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/juxorusakuzop.pdf
    • https://cdn.shopify.com/s/files/1/0432/9521/1680/files/37235728131.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5527/files/wuzeti.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1682/files/cbse_books_for_class_6_maths.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_off000068c2.bin
a7e0e3b99a4d97e62a3d02ab2fad7700e9ba0f1dc3b2ec46253fa7d173f3bf5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x68C2 5688 bytes
font_01_sfnt_off00007be8.bin
3d51ffbc5a6118ebf9da8ac2e32768816d7c75e03d0a3017c53a115718125b34
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE8 10072 bytes