Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f30613c58359949…

MALICIOUS

PDF

46.1 KB Created: 2020-10-31 21:33:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: b66f94053ca111a7a6570296193d3877 SHA-1: d29d6c8a964fa6612e78986dda386d0ab42f9bde SHA-256: 8f30613c583599493c1e13788dd35a48f0a59a51e29967bae8af642bc420b6b3
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/aws?keyword=a+true+friend+is+someone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_5f8db0b970fc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5f8e3e76c34c9.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/fiwoligujif-gedufoful-disotede-lozogetewuvup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_5f9cfc996ae84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f8cce87eaafd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f959e55309dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f86f457325c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f89e1ec0badb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_5f91fb761a392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f960496007f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_5f9d77d9a296d.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006a61.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006a61.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off00009dec.bin)
    • https://uploads.strikinglycdn.com/files/ec1138e6-ae7f-408c-997b-ecfd523346ac/xajat.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_off00006a61.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A61 4684 bytes
SHA-256: bb484821564668fbd863e888b0b571b3401ad656208742dcad08fe35e30ec3b8
font_01_sfnt_off00007a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A30 10452 bytes
SHA-256: aeaa4c793827e6015c37bede46bf483bc7ee22c82d7a0f2087ce5589eadbc385
font_02_sfnt_off00009dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DEC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2