Malicious PDF — malware analysis report

Static analysis result for SHA-256 663f67c41c008989…

MALICIOUS

PDF

60.4 KB Created: 2020-11-10 20:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4aa0f6eaf4c2b44816a8a67f4d7f6a1a SHA-1: 118928141608172df66cb407ae828b1da77b6424 SHA-256: 663f67c41c008989e93f7933d5ebac26e4df4ec13e0ea41bab0974cf496e857f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffking.ru/123?keyword=ruger+mark+1+mags In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5f9b4a9d70107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f8aa087485e1.pdfIn PDF document text
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/lofekarudavuna.pdfIn PDF document text
    • https://moxoviwepikiwu.weebly.com/uploads/1/3/2/8/132814726/5e28c27b554096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_5f91ee20a6195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fulomufimikim/the_crooked_man_poem_from_the_conjuring_2.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/bible_hebrew_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/3204915978.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/lacrosse_positions_girls.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/515680986.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D1 5096 bytes
SHA-256: 7b939af7926f82be9a3be4b14dc23372c5c6de1720728f71d3039d2cd91418b0
font_01_sfnt_off0000c31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31B 10152 bytes
SHA-256: 47048808bae8d0d3b2dd644127814ec6f32c6723eaaf31b80edf23fa69fc1ae1

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