Malicious PDF — malware analysis report

Static analysis result for SHA-256 77913949b4cd915b…

MALICIOUS

PDF

40.1 KB Created: 2020-08-22 17:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcb4d3572a9323456d49a64c479ee00d SHA-1: 61304155ac252a7309d930bd7076203d4d418638 SHA-256: 77913949b4cd915bcd2c05f59b423d61feb509b365b40acc9e7363502cf6c97d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same malicious URL. This suggests the primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=alloplastyka+stawu+biodrowego+andrzej+pozowski+pdf
    • http://files.elginartsassociation.com/uploads/1/3/2/7/132710783/5061134.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9468/7400/files/75757840170.pdf
    • https://cdn.shopify.com/s/files/1/0431/5932/2773/files/captain_queen_platform_bed_with_storage.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5669/files/kowikotunisapawerikoba.pdf
    • https://cdn.shopify.com/s/files/1/0436/7751/5941/files/broiler_production_guide_in_the_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0432/7427/2924/files/openssl_sign_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/tatalaksana_atresia_ani.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/zuxotanutetadis.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/invitation_letter_template_for_german_visa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0627/1394/files/payroll_management_system_database_project.pdf
    • https://cdn.shopify.com/s/files/1/0437/5927/2090/files/pilubiwikenuvefi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2806/8005/files/microsoft_publisher_halloween_flyer_templates.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/molarity_and_molality_formula.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_off00005932.bin
424ab84edc7d340d768376976720676b124069222b7e9b2ae48843207cc46909
pdf-font-stream PDF embedded font (sfnt) at offset 0x5932 5724 bytes
font_01_sfnt_off00006cd5.bin
716a4bbcf68963ff694f4200a1f3972ebcbad57aacc35f271d778539bab1c06e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD5 11648 bytes