Malicious PDF — malware analysis report

Static analysis result for SHA-256 51214382dabba447…

MALICIOUS

PDF

60.6 KB Created: 2020-08-08 21:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a67b68ccaae08aa92b675d9a394b2dd3 SHA-1: 875ecd85fa0210b19fe6ac2aab45482775ab42fb SHA-256: 51214382dabba4471d4be80e43480a8296d344388085a2b6bd91c05720b331f2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a redirector, which is likely intended to lead the user to malicious content. The presence of numerous links to external PDFs, many hosted on seemingly unrelated domains, suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=pyridine+piperidine+alkaloids+pdf
    • http://files.cottonginmuseum.com/uploads/1/3/1/3/131380849/kotevuwefapu.pdf
    • http://files.northernchainspecialties.com/uploads/1/3/1/4/131407796/71111330083d.pdf
    • http://files.hsfhomeconnections-hsf.com/uploads/1/3/1/4/131437627/sozusax_mesijuwoguzu_jivuterinu.pdf
    • http://files.qvschoolpsychology.com/uploads/1/3/1/1/131163955/tojif_minigelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/zumefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/econometrics_book_by_koutsoyiannis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/5337927077.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/cost_and_management_accounting_n6_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/nezumavoro.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0118/files/aristofanes_las_nubes_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/dependability_definition.pdf
    • https://cdn.shopify.com/s/files/1/0437/4750/8385/files/mupowaruzibeperur.pdf
    • https://cdn.shopify.com/s/files/1/0439/2294/8251/files/61465264672.pdf
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/kawizefomiwobivuni.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/61168440284.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/kesafilijujifejoza.pdf
    • https://cdn.shopify.com/s/files/1/0435/9811/9075/files/256628292.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/xodiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9024/files/categories_of_art.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c19.bin
07ce029dc907eb403e8560b708585318072b45bfbf485c5a26c8292c5c4353ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C19 5200 bytes
font_01_sfnt_off00009de1.bin
210850c2731ef8698549ae38a2f59122db239ddbe98c4693fe12254dcd061858
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE1 16180 bytes
font_02_sfnt_off0000cef9.bin
09554097f509d12e8620120fa439a2c39b5de1b415e2b8a577ad22ee67661791
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 16344 bytes