Malicious PDF — malware analysis report

Static analysis result for SHA-256 5752677ef1ef3353…

MALICIOUS

PDF

44.7 KB Created: 2020-08-27 18:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5876293ed08c31d1adc7f5b975088498 SHA-1: 1bd620ae76276acfaf450cae0963592572080ef7 SHA-256: 5752677ef1ef335388b4187648fe25273faeccec463b6f85f93b9a6b1908dca7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector infrastructure, suggesting an attempt to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.club/pify?keyword=seis+sombreros+para+pensar+ejemplos+practicos+pdf In PDF document text
    • http://files.communityplanningishere.org/uploads/1/3/0/7/130740069/somegazixinagolaw.pdfIn PDF document text
    • http://files.ibbeautiful.org/uploads/1/3/0/9/130970016/fasujanu-sinirifaj-zefakajupa.pdfIn PDF document text
    • http://files.fitstudiolancaster.com/uploads/1/3/1/3/131379939/020a064.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/1/0438/8395/4328/files/jidulutenituvobub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/defaweguzajilobiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6750/6845/files/55653030887.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4924/6110/files/java_eclipse_mars.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4421/6730/files/6278362656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/29174551616.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/73633590634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2264/6422/files/mefitoxovopajibimitewila.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0180/6997/files/70200447473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9721/8460/files/19803040774.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/little_inferno.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_off00006bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD3 5620 bytes
SHA-256: 0b0155a1458284d91530015024a1bed1cd733a6dcb2130507d87b3bb80f5b840
font_01_sfnt_off00007ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECB 11328 bytes
SHA-256: 1a31ccbe9da8988806383b162c7822ac1a35cf7bf5338fb28889f5f0ac2031d7

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