Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cff17713559767…

MALICIOUS

PDF

41.2 KB Created: 2020-08-11 05:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 94a1635f41d36cc8ef3023a234fd2d8b SHA-1: 31673297ac0898efc2d88603ffcfcde401b67a4f SHA-256: 42cff17713559767190a7e841040735bac9ef4444eeb6bd10c1fae69c4ecd3b7
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=albumina+en+orina+pdf In PDF document text
    • http://files.gh-bjj.com/uploads/1/3/2/3/132303270/vazagi-savijusire-pevokos-sugogobise.pdfIn PDF document text
    • http://files.talloaksmontessori.com/uploads/1/3/1/4/131437685/naxejalakemud_kikote.pdfIn PDF document text
    • http://files.velobristol.co.uk/uploads/1/3/1/0/131070602/ab83c4dbb.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/25696514874.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/xenev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5181/0969/files/velitodafenudumik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6879/2732/files/43765951044.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/27173620465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0300/2523/files/30316190511.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8697/1033/files/jee_maths_formulas_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/29128640826.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30549310566.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_off00006097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6097 5140 bytes
SHA-256: 74b9d50742e58ec807ce3bede21e57324e056c75760862705570b27d00313315
font_01_sfnt_off000071ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71ED 11412 bytes
SHA-256: 9c41a4fc228fd8c592e482eeffa853d7e7482d8a52ba7c05c6ea7d2c72b3ba57