Malicious PDF — malware analysis report

Static analysis result for SHA-256 e282de81bacee977…

MALICIOUS

PDF

37.5 KB Created: 2020-09-16 04:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e9888f5845f1d8dbcd18b8ad18f42bb1 SHA-1: 200daffb93be0d762b20c5900b0565034c936fa9 SHA-256: e282de81bacee9779e6d147403ffb94a4867b6a5e352472a68d00afa294b21e9
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.com/pify?keyword=linear+equivalents+classical+conversations In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/7820d0_d08fd4fadf3d42fa81026f59ea9dd661.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/610d21_3b6dd6b129a94beeadeee0a9a97beb73.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f35da0_8f8d266912a74fa2b83510a894012169.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c70c35_8f5a3c4663984406bda6b4f12abc31cd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_04eef45f742f4f87acb1d72b3f3c0026.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fd3290_43ebe81299cb4e1fb76dfa6f17f3fc38.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/510a18_29bd493e8bda4d738e59ac5406f9a326.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/828753_8207cc5b69124b4093f471e2770a8240.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/73f3b0_ded54199ef6a49df9ce5ac1b14428292.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/85c99c_c73ca16ef5ba487984b1d755ba24fcad.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/405339_1ad52c9442e848a5a3e20d991d54b43a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f51585_1536e0f0d5594b3886aa6430a6638dd7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/32771172400.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8951/7978/files/nivor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1481/5901/files/situdemoli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.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_off000053c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53C4 4920 bytes
SHA-256: 1d46ea3623be639b1af25b039ae12a170a9632207c01f83251c3c84ae6ea47bb
font_01_sfnt_off0000649d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649D 10688 bytes
SHA-256: 32a73c489ab43cb7d7539922b64ef11020f7c909fae5e6512facde72ca86019b

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