Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e3f830a6e7c7c5…

MALICIOUS

PDF

52.3 KB Created: 2020-11-03 04:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 662b68cff2061f726827462c54932a53 SHA-1: e387c29acbed6db9b329f7e63969587c76d0ed73 SHA-256: c0e3f830a6e7c7c5352e13ce75c55841dcaef97dd3b06dbf556f9f3cf85b357c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector. One of the primary links, 'https://gettraff.ru/strik?keyword=horse+drawn+hoe', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting the document's purpose is to lure users to this malicious site. The presence of many external PDF links further indicates a link farm or SEO manipulation tactic.

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://gettraff.ru/strik?keyword=horse+drawn+hoe In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f9ba01ef3182.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/sovusivofetat_wipimoko_winunis.pdfIn PDF document text
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/zuzikevepisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_5f9c6b5cc269b.pdfIn PDF document text
    • https://teguvubab.weebly.com/uploads/1/3/4/3/134347924/9632fbf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_5f9a37688883d.pdfIn PDF document text
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/vitifupegoraw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5f96020c3688b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5f951a4cbebdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_5f9d03ca9059d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad10e08c-edc7-4043-9205-4f60a6579d94/pipuzeme.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/gipobuwigalupota.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/completing_the_square_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd04bef4-4545-4531-a24b-ef1d37f38285/j_ai_voulu_planter_un_oranger_parole.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/96867361110.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_off00008f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F52 4936 bytes
SHA-256: bdef9a665384831a72e80834dbfaece80566cebe49360c7203420fb2a8f37176
font_01_sfnt_off0000a021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA021 10640 bytes
SHA-256: 1a5890a872403bce56c15dd242ba52e260337dfbed1a8f1abdc98e207e587d7c

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