Malicious PDF — malware analysis report

Static analysis result for SHA-256 953a981938bb63a8…

MALICIOUS

PDF

48.3 KB Created: 2020-07-14 21:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 8dba2f65c231886fc3c3deb415505590 SHA-1: 396b8b72c3f772b98a2bc4acecbac38ed3c21473 SHA-256: 953a981938bb63a88f63e19c4f451cde9f30a8867868cfe5039115aa6c4b6d3b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to a 'Dewalt 14 chop saw manual'. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to obscure the malicious redirector. The primary malicious IOC is the redirector URL.

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.ru/wb?keyword=dewalt%2014%20chop%20saw%20manual In PDF document text
    • http://files.giftedsupportnetwork.org/uploads/1/3/1/4/131453097/4810043.pdfIn PDF document text
    • http://files.woodlawncountryclubfc.com/uploads/1/3/0/7/130775970/1de93d2cc.pdfIn PDF document text
    • http://files.potamus-soap.com/uploads/1/3/1/4/131482926/4538079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kofimefek.files.wordpress.com/2020/07/34933170493.pdfIn PDF document text
    • https://forogov.files.wordpress.com/2020/07/giselitoganokobek.pdfIn PDF document text
    • https://boxavik.files.wordpress.com/2020/07/fikisulugavarisub.pdfIn PDF document text
    • https://nibixodowoxo171687391.files.wordpress.com/2020/06/xuvuwifosifelubonada.pdfIn PDF document text
    • https://zepajexoj.files.wordpress.com/2020/07/fogudurixedigesakigigago.pdfIn PDF document text
    • https://wizobumak.files.wordpress.com/2020/06/39151010917.pdfIn PDF document text
    • https://tidujexibego.files.wordpress.com/2020/06/vofotelojogazezutazat.pdfIn PDF document text
    • https://dodaxiji.files.wordpress.com/2020/06/jinalobigo.pdfIn PDF document text
    • https://lemanesoneme.files.wordpress.com/2020/06/13620801436.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/49219491162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/damuwasizebuzenex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/41005139131.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/xasokogudenes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/nuxovimil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nexunalazuzifoginiwaboliz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7438/8119/files/vusesipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/derosejudov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/1544273085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/jamivukosonoz.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_off00007d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D57 5144 bytes
SHA-256: e2e903767baf09022fffc163b5116d22db7ea414fe18a7e88b16564a5b366441
font_01_sfnt_off00008ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED3 10968 bytes
SHA-256: 7e6cc2c7e6801a919260977c932bdd2af187168623efe3599a827142b7107f76