Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12c135cbd6e4ad6…

MALICIOUS

PDF

39.8 KB Created: 2020-10-21 01:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e57c8f08e74d7162603ed5dd8e2be7af SHA-1: 9a40f51fd95bb589a82253dbe23997c041118979 SHA-256: e12c135cbd6e4ad68c9de6a73fd687e166c56c68a80858f8466f1f7025610ebd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik. The ML classifier also strongly indicated maliciousness. The document body itself contains obfuscated text and URLs, further supporting the malicious intent.

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=letra+de+santo+santo+santo+los+cielos+te+proclaman In PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/a8bc4.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/dc69227.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/ff3ef9.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/5686684.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/nujetenunekigemix.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/dosebafizapixu_vemavovurabeba_bonuvajudavix.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/65d1b7aea6faeae.pdfIn PDF document text
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/lelolipef-zizito-zazigenuwim-buwekunikukel.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/zetare/70517880191.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/namenawam.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/75868669127.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9027/2152/files/color_word_scramble_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0721/2190/files/best_tv_guide_app_for_ipad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5328/4008/files/punebabomesojiti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8521/2064/files/boturewagosedu.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/blockchain_applications_a_hands-_on_approach_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/barixunesawaturiwafumeka.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/79996521066.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_off000059f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59F5 5160 bytes
SHA-256: a7732fe922aefb1142b74ca22516af4ae2b1a1303de5e18708af7c25336eb653
font_01_sfnt_off00006b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6B 11104 bytes
SHA-256: bbf593928ff60443e28729b7efe4482b4de4a6a67c97a33c63401a9ef7f96b39

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