Malicious PDF — malware analysis report

Static analysis result for SHA-256 609e9768ea1b027a…

MALICIOUS

PDF

47.7 KB Created: 2020-08-15 06:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26bc4771e63d2b67fac589dcda1d5490 SHA-1: 6faffe390f6ba3528b37fa0389c78a0f34601dcf SHA-256: 609e9768ea1b027a03ae108143e41b4f288dc993cce440d38356f40d0e4cc9ce
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, https://ttraff.cc/wb?keyword=bartok%20viola%20concerto%20pdf, which is flagged as malicious. The document also contains a large number of embedded links to various PDF files, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points to a phishing or redirection attack.

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/wb?keyword=bartok%20viola%20concerto%20pdf
    • http://files.gccvista.com/uploads/1/3/1/6/131637658/judenebukelafep.pdf
    • http://files.azorff.org/uploads/1/3/2/6/132680852/078d8fc4b6ce.pdf
    • http://files.seetheworld.tours/uploads/1/3/2/8/132815961/bawifutopite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/0411/2545/files/asset_performance_management.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/minagusapikudi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/list_of_psychiatric_medications.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/marlin_firmware_anet_a8.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/xapalufanikivexi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/28580603341.pdf
    • https://cdn.shopify.com/s/files/1/0434/1864/8732/files/98777973681.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/panasonic_universal_remote_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/upsc_cse_maths_optional_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/24895083963.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000685c.bin
9a21bb0af12db94f995501d91f8032bdf9a991da08cc6474e10b4ff7aae7eaef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x685C 5144 bytes
font_01_sfnt_off000079f2.bin
d1ebbacd68b176ca65b7835803ddc96c6b699c7d83141d7a3fc47e9d58973abd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F2 10080 bytes
font_02_sfnt_off00009cad.bin
9527d77a8ddbff7143f4b9d9ffa6a9c0a17c14fbd864be9d9139927b2451880e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CAD 16200 bytes

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