Malicious PDF — malware analysis report

Static analysis result for SHA-256 b891a1190ab0861b…

MALICIOUS

PDF

39.6 KB Created: 2020-08-14 22:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: cbb1e1f28e53dc7a09402dfa9b7bf756 SHA-1: 61aaff82470bb3323564942efe0383cce8fab128 SHA-256: b891a1190ab0861b08d1b258e6a2ea548ed86f034734e7fae19e2452cbc8599a
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://ttraff.com/pify?keyword=esquizofrenia+paranoide+cronica+pdf In PDF document text
    • http://files.worldtravelhacker.com/uploads/1/3/1/4/131454620/kexugovalo.pdfIn PDF document text
    • http://files.etnomusikologiusu.com/uploads/1/3/1/3/131383548/448576.pdfIn PDF document text
    • http://files.maximilianlaw.com/uploads/1/3/1/6/131606128/15e0a67294.pdfIn PDF document text
    • http://files.sterlingstables.com/uploads/1/3/1/3/131379732/dekupolekerosudu.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/1/0432/1817/4107/files/viranofopukaseteromararus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/85851669567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/kavepavevujef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1481/4882/files/94094734854.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/12978693394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3637/6214/files/11514667446.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/25885203825.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/64900297102.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_off00005e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9A 5248 bytes
SHA-256: bc964e803cbadc6a36bd4bb7da87e39aaa7182a7dbe57af87eeb65fb31d8da41
font_01_sfnt_off0000708b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x708B 9792 bytes
SHA-256: edbc02bd73cb25314158e6e2b8bbb6d906675acf345cb2b850eaa78edf8e55dc