Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bfbde51d00138e…

MALICIOUS

PDF

67.8 KB Created: 2020-07-18 21:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 88996eb6095e1e8368e9c783303957fd SHA-1: 1727d4382b43f5aff668030075a67a6c7f77082a SHA-256: 15bfbde51d00138e54fb1e7630c5b5b3676f06c67863c297d53798e9ef9acbf2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document's content and structure suggest a phishing or scam attempt, masquerading as a technical document to entice clicks. The ML classifier strongly indicates maliciousness, and the presence of numerous SEO-optimized links further supports a malicious intent to drive traffic to harmful sites.

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/wb?keyword=coal%20fired%20power%20plant%20process%20flow%20diagram%20pdf In PDF document text
    • http://files.spilt-salt.com/uploads/1/3/0/7/130775828/916198.pdfIn PDF document text
    • http://files.kymoversandmakers.com/uploads/1/3/1/3/131383467/2903792.pdfIn PDF document text
    • http://files.mcyyang.com/uploads/1/3/1/8/131857916/9085229.pdfIn PDF document text
    • http://files.shopqal.com/uploads/1/3/0/8/130813732/445206.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fotifumiwo.files.wordpress.com/2020/06/wigimigatade.pdfIn PDF document text
    • https://jakuwil.files.wordpress.com/2020/06/16471271598.pdfIn PDF document text
    • https://jidiluda.files.wordpress.com/2020/06/95891308370.pdfIn PDF document text
    • https://vamufif.files.wordpress.com/2020/07/16069093947.pdfIn PDF document text
    • https://sajovuvinar.files.wordpress.com/2020/07/vosezosugixiwemasukijuki.pdfIn PDF document text
    • https://jenunosij.files.wordpress.com/2020/06/79454869758.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/21169463537.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/mitujalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/zisaririnavofejotijod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/79014522416.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/gululepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3334/6719/files/pakowiraxevuzoriberimat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/taxodajuloferowerakukelo.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_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 5376 bytes
SHA-256: 7e0a1b3916fc19210e74f83d9f4389db74ee16ec867fe05d3c48f70c8f90e95e
font_01_sfnt_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 11008 bytes
SHA-256: 6418e18fcd61d0efee74cd26a150dc9d33ed34962ffe9a0fcdaad3d704e31f0d