Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe5b104e78059f7…

MALICIOUS

PDF

39.1 KB Created: 2020-10-12 08:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7083ea960dd434329c2aa4d831b04cb0 SHA-1: 357501e4bca9f77de8bc31cd9b5772c075f1f7b5 SHA-256: 8fe5b104e78059f7a817a67616ebc3600ec1ded15edcd2bab51591d25b6377f7
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link-farming or SEO manipulation scheme. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be the distribution of malicious links, likely leading to further compromise or phishing attempts.

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://ggtraff.ru/pify?keyword=time+whitechapel+documents+of+contemporary+art+pdf In PDF document text
    • http://files.yogawithbobby.com/uploads/1/3/1/3/131384638/4ef17.pdfIn PDF document text
    • http://files.enlightensatori.com/uploads/1/3/0/7/130739827/3334129.pdfIn PDF document text
    • http://files.mrspeabody.com/uploads/1/3/1/4/131438121/jewez.pdfIn PDF document text
    • http://files.sfkart.com/uploads/1/3/0/7/130775665/abd3e38a7a.pdfIn PDF document text
    • http://files.poverty-conference.org/uploads/1/3/0/7/130775292/5f5a3f.pdfIn PDF document text
    • https://site-1036969.mozfiles.com/files/1036969/2968100601.pdfIn PDF document text
    • https://site-1037914.mozfiles.com/files/1037914/48111994598.pdfIn PDF document text
    • https://site-1038792.mozfiles.com/files/1038792/dupifatimizunomubaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1516/3032/files/sparkling_gems_from_the_greek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8199/7717/files/freddi_the_fish_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2170/9724/files/two_syllable_compound_words_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4544/5528/files/lufivegaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4dbc6e9-cd83-48ab-8e0a-2fc335d9299c/fixoloj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00fa003b-0d95-4eec-b6ca-cfebbc1cdf83/viniwolalemis.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_off000058d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58D0 5540 bytes
SHA-256: 345e94f1d14aa88d26a7762967b40c95ce77f26c05ecaae38c1963cdd243d81c
font_01_sfnt_off00006b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8D 10544 bytes
SHA-256: d191576d58e0a708ef44bc466131dcca7cf0db51431b1107161e9bbe304d8e5e

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