Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cb35f9fd9e030d…

MALICIOUS

PDF

40.4 KB Created: 2020-11-03 01:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: b9fc448aef359241e5d46a187b196c6f SHA-1: aa6ba074a975f9ed563c960c8cf1b65efc0860b7 SHA-256: 05cb35f9fd9e030df4037e8bfe1a75c5528fc773a8245eabf72b78c56a594582
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?keyword=pewdiepie+tuber+simulator+mod+apk In PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/76c30d49.pdfIn PDF document text
    • https://subonotewus.weebly.com/uploads/1/3/4/3/134347286/vazotezawomuko.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/lokujevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006147.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006147.bin)
    • https://cdn.shopify.com/s/files/1/0433/7411/7015/files/mental_math_strategies_anchor_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/wetaganobugiselutigojojiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3499/1528/files/fundamentals_of_power_semiconductor_devices_baliga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4896/8100/files/93883771674.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/tisofigevelapita.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/24052724299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/long_vowels_worksheets_free.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 extracted file (font_00_sfnt_off00006147.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6147 5404 bytes
SHA-256: 4b134444be1e25d3c87a0ef31d0d243dfb00154c2a2033b13d569ad4b93968ea
font_01_sfnt_off00007393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7393 9820 bytes
SHA-256: 1aa6d1ab60db56de9e7e3278391e075e4ae374da84dfbaf610ef93fcf5a3e4fb