Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0fe413c38d500f…

MALICIOUS

PDF

57.9 KB Created: 2020-10-01 12:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a7ebcf3652018d39c55f53bc7e359421 SHA-1: 3719bfbf196b0d3c50c02d81b7564b41a5ecc6c1 SHA-256: ed0fe413c38d500ffa6a5dd8c668d4164029130e76c02c55576fe9f4417d70d6
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=machine+learning+algorithms+pdf+packt In PDF document text
    • https://site-1036985.mozfiles.com/files/1036985/28007582003.pdfIn PDF document text
    • https://site-1036812.mozfiles.com/files/1036812/21947981538.pdfIn PDF document text
    • http://files.awkwardsilencejax.com/uploads/1/3/0/7/130775828/6884040.pdfIn PDF document text
    • http://kodobigog.mengjiechen.com/uploads/1/3/0/7/130739416/sariruxifug.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/1/0433/6625/2703/files/hubba_bubba_squeeze_pops_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/disable_chrome_software_reporter_tool._exe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6656/0163/files/teacup_yorkie_puppies_for_sale_in_oklahoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7079/8489/files/kroger_fred_meyer_routing_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3447/6449/files/brave_internet_browser_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2135/1587/files/javowunonokulemelip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3472/8853/files/42897927561.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_off0000a535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA535 5640 bytes
SHA-256: 805acc0c1cc46351143bf0381e01bb1baeb8a5e9530e2aef75200e803b1d26a7
font_01_sfnt_off0000b844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB844 10192 bytes
SHA-256: c49a97cc78eabd917aa324e607d095c16a07695e47150f62520395b9a56bcd31

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