Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcd4a139fdcf700…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 13:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4efdd0922ce994a7f0c372df73b68bf SHA-1: 6406e570e676c5dd8716345225610aeb97da329f SHA-256: 4bcd4a139fdcf7006f2d83326cadd19b7ac092ca7872108ac61f0010386afa22
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at https://ttraff.ru/wix?keyword=critica+de+la+razon+pura+kant+libro+pdf. The document body, though heavily obfuscated, appears to contain text related to the linked URL, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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/wix?keyword=critica+de+la+razon+pura+kant+libro+pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/zurich_life_insurance_company_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/benzel_spine_surgery_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/4092/9957/files/livugatovanafepo.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/commutative_associative_and_distributive_laws_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/certificat_de_vente_voiture.pdf
    • https://static.usrfiles.com/ugd/353d00_ba4f36f17f8845a48b78c149baa57d14.pdf
    • https://static.usrfiles.com/ugd/b8c837_e05996274a114557ba240fe8438ab133.pdf
    • https://static.usrfiles.com/ugd/b8c837_455e295a74104e64b1b901251d27e431.pdf
    • https://static.usrfiles.com/ugd/1be480_070bee5270fa446c975a9f652495c023.pdf
    • https://static.usrfiles.com/ugd/10b11f_9de11be6d5a8440a9d496f4f842ccbb4.pdf
    • https://static.usrfiles.com/ugd/299074_da05088ea83b4a3db841a0c19a457ba6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d16b9d2c77d5454a941cd3e21d0d2f7c.pdf
    • https://static.usrfiles.com/ugd/39cb9d_07c0e67782334c9b83216f23b2fef080.pdf
    • https://static.usrfiles.com/ugd/b8c837_eede3ab716d54fe9b473468c1b025f2a.pdf
    • https://static.usrfiles.com/ugd/10e3af_2c9b18a71862459d99ed511b6fb0ef03.pdf
    • https://static.usrfiles.com/ugd/33ab24_9d8c28f8cc5e4a9d86aac88b289fe221.pdf
    • https://static.usrfiles.com/ugd/ee4a13_a249d2c2a53d401fa2d985dc9fdf577d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bec.bin
fe1955c001b87d1602931e76a5952ee713387c2d54e47640160b3d8fc81b76a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEC 5128 bytes
font_01_sfnt_off00006d66.bin
da6c025f866324f260fa17115da767903637a0b92661dd57ca48b829568db6ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D66 10488 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.