Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a77c3e8c94dd8b…

MALICIOUS

PDF

38.6 KB Created: 2020-08-17 14:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 544fb2aef4b162ca6464f0990e04ed5e SHA-1: 7e40a6872e3b19136f647463b9b573e9326137ab SHA-256: 15a77c3e8c94dd8bd408fbbd98482454d87e19e36d17f51c16d51e12a7d8cddd
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=12+compartment+exam+date+sheet+2019 In PDF document text
    • http://files.blastpyro.com/uploads/1/3/1/6/131606368/7406642.pdfIn PDF document text
    • http://files.wmadamsphotography.com/uploads/1/3/1/4/131452876/mafetajedola.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/1/0441/0087/8488/files/skyrim_star_wars_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/scars_james_bay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3298/3190/files/biomorphic_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/padre_raniero_cantalamessa_libros.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/66571393948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2697/0786/files/90036364320.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/numeros_ordinais_em_ingles_de_1_a_100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/vobumowumuwikuzex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7967/9646/files/45329480092.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_off000057bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57BB 5736 bytes
SHA-256: cbebd45beda4783c3f6bd13028cbcc7bf2afbf7e06d135c9d730b0ccad5b882b
font_01_sfnt_off00006b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B03 10196 bytes
SHA-256: e535fe8065c97d1d321e907418f31208e1ae7176946578ec182fa58a933a62c1