Malicious PDF — malware analysis report

Static analysis result for SHA-256 6383da023c1f2372…

MALICIOUS

PDF

49.6 KB Created: 2020-08-05 02:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7454b3d2ae2938935b4b821587bbb8df SHA-1: 539d053fec381d2f76b4019cbe1d786bbad2d8be SHA-256: 6383da023c1f2372aa6c1a7ca3dcddb1d0d70669a74d7bf60c4509ca454adfc9
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to a link farm hosted on Shopify, but one critical link directs to a known malicious redirector at `ttraff.ru`. The document's content, though heavily obfuscated, includes the URL `https://ttraff.ru/pify?keyword=m13+phage+vector+pdf`, suggesting an attempt to lead the user to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=m13+phage+vector+pdf
    • http://files.friedrichsfamilyadventures.com/uploads/1/3/2/6/132683252/rixikisatepuwa.pdf
    • http://files.usfitnessfreaks.com/uploads/1/3/0/7/130738921/xeguwemo.pdf
    • http://files.deathpenaltycurriculum.com/uploads/1/3/0/7/130775221/nubiriboro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43181801848.pdf
    • https://cdn.shopify.com/s/files/1/0434/0852/3416/files/voligikowiwepug.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/aws_solution_architect_exam_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/mutipebu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/91592818515.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/rodal.pdf
    • https://cdn.shopify.com/s/files/1/0428/6867/0620/files/delukubaxamenosikimula.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9190/files/gejedawodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/pdf_import_for_apache_openoffice_4._1_3.pdf
    • https://cdn.shopify.com/s/files/1/0438/0642/5248/files/pepigedesi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4968/files/wabakazuzufepoxogepagaseb.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/zogokemuxinoxeweximi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/49567822753.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_off000082b0.bin
e84ec0257017736881f219b23f9e40002981707ad784f0c53dc57dbc42c645fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B0 5488 bytes
font_01_sfnt_off0000957a.bin
528faa20e4411dc292c5a9578c9a6e46fb40351fdfbd5f0773977e8e51acb67a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x957A 10564 bytes

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