Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d26151a20d0ace3…

MALICIOUS

PDF

43.7 KB Created: 2020-08-09 04:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 38db5ad09745b89ed826a127e17f3165 SHA-1: bc5d8d1958729549944cb7c8610d0a412fdab1ce SHA-256: 3d26151a20d0ace34a5b8409fc9fd9f133018b94c8a096f1687dd6fe6829b176
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.ru/pify?keyword=detailed+lesson+plan+in+math+grade+3+pdf In PDF document text
    • http://files.txstudentcivics.org/uploads/1/3/1/8/131857041/3271080.pdfIn PDF document text
    • http://files.cxgreenworks.com/uploads/1/3/1/8/131856076/jazisotawaw.pdfIn PDF document text
    • http://files.howtobeaweddingofficiant.com/uploads/1/3/0/7/130776682/komesuba.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/1/0433/0687/7080/files/gekubamunanapomokavonata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/76482933942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/95013158570.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2952/6690/files/powerdirector_15_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5920/6549/files/budotugomezojiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1374/1472/files/vafapizazawiripu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/42035111768.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/60968316484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/70470290326.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/puzelibobisezomomeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/usos_del_aceite_de_palma.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_off00006b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6F 5616 bytes
SHA-256: 128e088d8d38cf79a96429930a8750a6a1c279d34f965413ab21b97bbe27278a
font_01_sfnt_off00007e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E64 10288 bytes
SHA-256: 98bd3f3ca07f8020c22f5ec808fd34c856f84400ba390b88db8a069730aaf673

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