Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4cb5d2c97861c5…

MALICIOUS

PDF

47.1 KB Created: 2020-08-25 09:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: d42d9dd7b7a070516e21dda25c16b5d9 SHA-1: cb28a128ed590488a3bae6ceb89fba3edd90b195 SHA-256: 3c4cb5d2c97861c59038de3e954524371147dcb0851b1261c8ccfe44c7b5b58c
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.cc/pify?keyword=guidelines+for+logo+design+contest In PDF document text
    • http://files.yodaveproducts.com/uploads/1/3/1/4/131408100/dotorijawoma.pdfIn PDF document text
    • http://tolimer.pocushub.com/uploads/1/3/1/8/131856408/a9bb5.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/1/0428/1093/3414/files/89246742686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2324/3176/files/14590400907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5027/7783/files/beauty_and_the_beast_2014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/14997656109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/65795728604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/cambridge_english_for_engineering_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/amabile_giusti_cuore_nero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/31334793838.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/27815545797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8223/4521/files/46247162661.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/vutetolafezi.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_off00007ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB3 5008 bytes
SHA-256: 5c3c5cdca98732060dd2f7dc4939a4216a22c9e8c631add3c5d0c7f847ade46d
font_01_sfnt_off00008bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC6 10540 bytes
SHA-256: 5c10900e9cc08ea45eb7c262306b2844b3c859b7d780a6b8aa6ec1f51c7cc52f