Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a0cd16dac4fa52…

MALICIOUS

PDF

47.3 KB Created: 2020-10-31 17:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-10
MD5: 72fc8c5fe6dac4bd49d13f569c041111 SHA-1: a1cc4b52ea2b7e61bf9727590915e37dfa4f707e SHA-256: 28a0cd16dac4fa52ce4c4bece4592942078671b236388a3aafd4dfaeaaac8ac6
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=point+beach+state+forest-+two+rivers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f9c98365ca9e.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/sidubanoxeronevufibuzaxaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f875db882563.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/riliwenetumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_5f98b38ca88ad.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/87717984535.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/jatuwozexelofexif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_5f9904292b4a0.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/que_es_la_apomixis.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/supply_chain_management_articles.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000078bd.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000078bd.bin)
    • https://uploads.strikinglycdn.com/files/8df9bce3-c410-4bd4-82bf-a7b44998e299/6837594439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3e6c63-df62-4914-9d86-319da227ea74/rudetojelewutamag.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_off000078bd.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78BD 5264 bytes
SHA-256: 1b9e9a15e77d249c7f1f090bb1f9a86e2375eaf00a63585a0597e34cf1a49c0c
font_01_sfnt_off00008abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABE 11044 bytes
SHA-256: b2d989ebadbcdf2e571fb9005132d5b40264d5fcc093a738e35e054560ab385a