Malicious PDF — malware analysis report

Static analysis result for SHA-256 633c5a811c67e7df…

MALICIOUS

PDF

32.9 KB Created: 2020-08-12 20:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4073fd166894b1ae2e420c91ce098fea SHA-1: 586dfe29e2022c64638fef56ed9f59955f38dde9 SHA-256: 633c5a811c67e7df641a03083a55626842a2f48962fcac474d741914a8f68a42
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains the malicious URL, suggesting an attempt to lure users to a harmful site. No scripts were extracted, but the presence of numerous links points to a phishing or malware distribution attempt.

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=neither+nor+either+or+both+and+exercise+pdf
    • http://naliror.rainforestab.ca/uploads/1/3/0/8/130814328/wazira_pagutenadoser_buzexawakajode.pdf
    • http://files.nottinghammassage.com/uploads/1/3/2/6/132681885/3948861.pdf
    • http://jofuk.indoorcyclinginstitute.com/uploads/1/3/0/9/130969772/vutubovimafajil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2881/4760/files/2803943033.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/netamomeziwipi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/gexubobapipozibojabudo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3315/7014/files/small_converter_software_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/m_torrent_3._3._1.pdf
    • https://cdn.shopify.com/s/files/1/0431/9779/2420/files/gobenawubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/25627313723.pdf
    • https://cdn.shopify.com/s/files/1/0451/9398/6199/files/antibody_drug_conjugate_review.pdf
    • https://cdn.shopify.com/s/files/1/0435/5126/0823/files/51551608783.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/consciousness_and_the_acquisition_of_language.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/artificial_intelligence_for_enterprise_applications.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_off0000446b.bin
21dc1dc4ab890e50a6800d1052173da9ce8b6afd61378fa5bada7aacfe39fd40
pdf-font-stream PDF embedded font (sfnt) at offset 0x446B 5388 bytes
font_01_sfnt_off000056b4.bin
9162c2e51d6bf730cfee4c797a760bf7bada544466c05bfc7e2c6504d0c9e658
pdf-font-stream PDF embedded font (sfnt) at offset 0x56B4 9356 bytes