Malicious PDF — malware analysis report

Static analysis result for SHA-256 771eeecdbcb80fe5…

MALICIOUS

PDF

51.7 KB Created: 2020-10-31 08:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 609079bd2147b560870a1783def642b3 SHA-1: 2e20fff71b2c0a1d78c9bdd9429b3466de02943c SHA-256: 771eeecdbcb80fe5634c32e9ce1acc6b7dc1720d7d867ac1826f30e88d761f06
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious destinations. One prominent URL, 'https://cctraff.ru/strik?keyword=droid+maxx+price+without+contract', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the intent to redirect users to potentially harmful content.

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://cctraff.ru/strik?keyword=droid+maxx+price+without+contract In PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/d1db2.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/dikujorewis.pdfIn PDF document text
    • https://voledobaseju.weebly.com/uploads/1/3/0/9/130969813/japelareneka-fepat.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/sesafefanulokam/bowapubawevajuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e917bf8-47df-4b1b-b80d-8f54e8531445/sewirezokimonipu.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/nolodekawed.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/hpi_savage_x_4.6_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/97467996687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a7deb7-1f0d-43c8-89b8-367d390a9992/81770688585.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/tureposivuwir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15885675-c59c-4913-9ece-7facc0623941/98067290525.pdfIn PDF document text
    • https://s3.amazonaws.com/nepawigexa/columbia_county_dmv_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe539a65-c723-4838-afd4-902b93ee8318/joxapewajisigares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae71883e-c4c1-4435-a9f2-2a6e93d5dc57/megasevomazupevinadog.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_off0000899b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x899B 5260 bytes
SHA-256: 5d734ad6b71f4a243dac8461b17efcfd8055d0d1142ef372d36b06b686b30636
font_01_sfnt_off00009b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B6C 11364 bytes
SHA-256: 3657a83a636724a607715eba79c7d1d3efa74b81ba6278e55c7d313b9663f05b

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