Malicious PDF — malware analysis report

Static analysis result for SHA-256 63728c95d957dad1…

MALICIOUS

PDF

42.9 KB Created: 2020-08-06 19:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3407d9294335056cbcd878043d2bf2b5 SHA-1: 7012a2fac83ad68b340aacdf17c991139547c55b SHA-256: 63728c95d957dad10bb26723eb765c8e3a70dab8f459577fa08e18bb09c29014
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that leads to the redirector, suggesting an attempt to lure the user to a malicious site. No scripts were extracted, but the presence of multiple external links indicates a potential link farm or phishing attempt.

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=capsular+staining+pdf
    • http://files.katetenenhouse.com/uploads/1/3/1/4/131454883/1395416.pdf
    • http://files.jackfew.com/uploads/1/3/0/7/130738870/ff3896.pdf
    • http://files.kcbakes.com/uploads/1/3/0/8/130813528/gatujadutani-dorodexafikun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/2165/3400/files/49345746731.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/42674331818.pdf
    • https://cdn.shopify.com/s/files/1/0438/8500/2920/files/jegapipamekan.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/67031742889.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/24068063056.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/discrete-_time_signal_processing_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/cinderella_solution_quick_start.pdf
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/doresazoxuguratisajatij.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/ibps_exam_calendar_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6852/files/62173034400.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_off00006aa1.bin
fcd465953a149fb5c63deff913c003a32dfbcce5461fa26a66c6f0026ecd6d6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA1 5112 bytes
font_01_sfnt_off00007c0f.bin
2755d7026d227b07e49c9b62faf4472d0c8a7267d6ab942ed8c0f21076389773
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0F 10256 bytes