Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a805175c257df1…

MALICIOUS

PDF

46.2 KB Created: 2020-10-29 16:19:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: a21f874bc15ebe24a12a1944f2139b35 SHA-1: 649792466f951d0c1d42cc589073f4b99a54fc6b SHA-256: 57a805175c257df175fe59a7e300e6c1c31ac8a397bea7886d6553e7cacf87d5
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.link/pify?keyword=huawei+ascend+xt2 In PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/55d70a27525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f98f7802901e.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/9056575.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006e7e.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006e7e.bin)
    • https://s3.amazonaws.com/mijedusovineti/98713840271.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/34519867488.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/zugisutisavurudowix.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/ascii_hex_table.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/value_added_tax_act_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/69791967299.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/anexo_14_oaci_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/duxavu.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/small_estate_affidavit_texas.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_off00006e7e.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7E 5056 bytes
SHA-256: e8a5f0d19a06c298b0798a4306eb5336543de85c1eb9587cc14f5d0158e24771
font_01_sfnt_off00007fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD9 13012 bytes
SHA-256: 0bf554eaacdf8da85cce5e984eddf92d58006a266bd141b4ed4f29885ab44dd4