Malicious PDF — malware analysis report

Static analysis result for SHA-256 636d4dbf127fe89a…

MALICIOUS

PDF

39.1 KB Created: 2020-08-17 11:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45cf7e123107761e1dcdbb5a0688ec7a SHA-1: 11dbeb6d162a6ed2b63f20c8d780a0d2d48c4dc8 SHA-256: 636d4dbf127fe89adad1c71003e5a6b647807767df6308277aaa33b43e864747
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for malicious redirector links, pointing to 'https://ttraff.cc/pify?keyword=bcd+to+gray+code+pdf'. It also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the redirector link suggest an attempt to lure users to malicious content.

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=bcd+to+gray+code+pdf
    • http://files.laurenmelodyshell.com/uploads/1/3/1/0/131071082/wuxidojidinud-rojod-sosapigeluji-pogemupurojev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2286/0956/files/debusabetipedemutus.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/black_sheep_movie_in_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/xogatakaruxenugiludoduvi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3283/6256/files/employee_interview_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/informe_de_levantamiento_altimetrico.pdf
    • https://cdn.shopify.com/s/files/1/0436/2102/3904/files/writing_equations_in_slope_intercept_form_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8203/1007/files/33896047462.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7236632937.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/used_car_bill_of_sale_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/fakibepifa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8530/6782/files/big_data_ebook.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_off00005cb5.bin
0a96fa8c8b2ade55a251c76250c9132c36af91ed14e9c9ccbcc154ecea33c174
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB5 5264 bytes
font_01_sfnt_off00006eaf.bin
f2aa573523d5ac50c3c17c8c02a6ded8a2d7699ffda4f1a4872d4f0472061593
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAF 9832 bytes